Serfas ST-17i CO² Inflator / Mini-tool (Product Review and Giveaway)

07 Jan

I’ve never kept count, but I imagine that in the past 10 years I’ve purchased at least 20 different compact multi-tools for my bikes. Like the Cynic philosopher Diogenes who spent his time looking for an honest man, I spend my time looking for great bicycle products. A few weeks ago the folks at Serfas sent me one of their new products for review, the Serfas ST-17i CO² Inflator / Mini-tool, and it has a few features that ought to be of interest to any cyclist. As an added bonus, I’ve not seen this product reviewed anywhere else yet—and I am always delighted when I can share new products with my readers.

Serfas ST-17i CO² Inflator / Mini-tool

Serfas ST-17i CO² Inflator / Mini-tool

Here is a breakdown of the seventeen tools in the Serfas ST-17i CO² Inflator / Mini-tool: Eight Allen keys (8, 6, 5, 4, 3, 2.5, 2, and 1.5mm), one 10m open wrench, four spoke wrenches (3.23, 3.3, 3.45, 3.96mm), a chain break tool with two chain retainers, two Torx drivers (T25, T30), CO² Inflator head, and both a Philips and flat head screwdriver. This tool has a full metal body and is 2.75″ long, 1.5″ wide, and .75″ tall. This products weighs an even 4.0 ounces (114g).

Serfas ST-17i CO² Inflator / Mini-tool

Spoke Wrench and Chain Break Handle

The Torx drivers are mainly needed to tighten the bolts on disc brakes (usually found on mountain bikes). In case you are wondering—Torx bolt heads resist slipping better than Philips head bolts, and there is less chance of stripping a Torx head bolt.

Chain Break Tool on the Serfas ST-17

Chain Break Tool on the Serfas ST-17

The chain tool on the Serfas ST-17i is one of the best I’ve ever seen on a cycling multi-tool. I never throw my old bicycle chains away—I keep them so I can test chain break tools! When I put a short length of chain on the Serfas ST-17i I was surprised to find out it had a self-centering head since it’s not mentioned on the package. The self-centering head means that your chain will not slip as you are working on it. Even if you keep your bicycle chain clean and well lubricated it is going to wear out. While it is always best to replace your chain before it wears out, some cyclists (maybe most) just don’t check very often to see how much their chain has stretched. If your chain should snap when you are out on a ride you will need this tool to remove the damaged link and put the chain back together. If you are not sure how to use a chain tool there are several good videos on that can show you how they work (most of these tools work the same way).

CO² inflator Head on the Serfas ST-17i

CO² inflator Head on the Serfas ST-17i

The biggest selling point for the Serfas ST-17i is the CO² inflator head (Presta valve only) that is built into the mini-tool. It seems like nearly every time I get a flat tire it is during a rain storm (this past Saturday it was during a snow, sleet and slush storm). The small CO² inflator heads that most cyclists carry are easy to drop (especially when wet), but since the CO² inflator head is built into the body of the Serfas ST-17i it is very easy to handle and even easier to use.

There are two items lacking from this tool: a tire lever and a carrying case. You always need to have a pair of tire levers with you when riding, so make sure you pick up a set before you head out. The lack of a carrying case is no big deal since most of the ones that come with cycling multi-tools just take up space in your saddlebag anyway. However, loose items in a saddlebag will make enough noise to drive you crazy on a long ride. A great way to prevent the noise is to put loose items in a short length of on old inner tube and seal up one end with the glue from your tire patch kit. By the way, I also keep my spare CO² cartridges in shorts lengths of inner tubes as well.

The Serfas ST-17i CO² Inflator / Mini-tool retails for $45 and can be ordered from the Serfas Website or from almost any bike shop in America. If you like this tool but have no need of the chain break or Torx wrenches you should check out the Serfas ST-13i CO² Inflator / Mini-tool (it retails for $36). One step above the Serfas ST-13i is the Serfas ST-15i CO² Inflator / Mini-tool. The Serfas ST-15i comes with two tire levers and glueless patches (it retails for $40).

As some of my regular readers know, I seldom keep the products that are sent to me for review—most of the time I give the products to random visitors who comment on this blog. However, I’ve decided to hold a contest for this beautiful Serfas ST-17i CO² Inflator / Mini-tool. To enter the contest all you have to do is pick a number between 200 and 500 and enter it in the comment section below (you don’t actually have to make a comment). The contest ends at midnight (CST) on Friday, January 11, 2013. After the contest closes I will use a random number generator to pick the winning number. If no one has the exact number the person with the number closest to, but not over, the winning number will get the Serfas ST-17i I reviewed today. In case two or more people chose the same number the first person to pick the number will be the winner. This contest is for U.S. residents only and only one entry per household allowed. When the contest is over I will publish the results in the comments section of this article. I will mail this product to the winner via Priority Mail at my expense.


Tags: , , , , ,

105 responses to “Serfas ST-17i CO² Inflator / Mini-tool (Product Review and Giveaway)

  1. billgncs

    January 7, 2013 at 7:19 AM

    Good article, I like the idea of the embedded infiltrator, and using the inner tube pieces to deaden noise.

    I keep a sliced piece of inner tube to put under my carbon bike before I put it on the rack in the garage. Keeps it from getting marked.

    Do you find your chains needing replaced at a regular mileage ?


    • All Seasons Cyclist

      January 7, 2013 at 10:19 AM

      I have five bikes and all of them eat up chains at a different rate. My old Trek 1200 only has one chain ring in the front and a Shimano Alfine IGH in the back (front the chain’s standpoint it is a single speed) and I have over 2,100 miles on the chain with almost no wear whatsoever. On the other hand, one of my old mountain bikes chews up chains rather quickly (less than 2,000 miles) mainly because the chain is always full of sand and mud by the time I get home.

      • billgncs

        January 7, 2013 at 10:08 PM

        thanks, I have lots to learn.

        • All Seasons Cyclist

          January 7, 2013 at 10:13 PM

          Bill — I plan on writing an article on chains and chain tools within the next few weeks.

        • billgncs

          January 7, 2013 at 10:14 PM

          great! do you use a sram chain with the special link?

        • All Seasons Cyclist

          January 7, 2013 at 10:20 PM

          I use SRAM chains with a master link on four of my bikes (all except the Trek Madone). One of the tools I want to review is the Park Tool Master Link Tool — it makes removing the master link a LOT easier!

        • billgncs

          January 7, 2013 at 10:21 PM

          thanks again! ride safely!

  2. Jennchi

    January 7, 2013 at 7:32 AM


    Holy moly, that would take the place of three items in my bag.

  3. eliotcresswell

    January 7, 2013 at 7:36 AM

    332. Thanks for the review.

  4. Cary Gossett

    January 7, 2013 at 7:40 AM

    Well done. Very cool 🌀

  5. Joboo

    January 7, 2013 at 7:50 AM


  6. Chatter Master

    January 7, 2013 at 7:51 AM



  7. Steve C

    January 7, 2013 at 8:38 AM


  8. scarver

    January 7, 2013 at 8:39 AM


  9. Alex P

    January 7, 2013 at 8:48 AM


  10. frankoshanko

    January 7, 2013 at 9:18 AM

    Nice article! It’s been a while since I took a bicycle repair class and my chains have held up well. I guess I need to ride more! I’ll guess171.

    • All Seasons Cyclist

      January 7, 2013 at 10:20 AM

      If you are not wearing out a couple chains a year you need to ride more! 🙂

  11. Jeff Katzer

    January 7, 2013 at 9:37 AM

    Ok, I’ll pick 222
    But more importantly let me say nice work on the closeup detailed photos. Regarding the need for tire levers. I have been using them for… several decades… But the first time I had a flat on my new 29’er I just peeled the tire off and replaced it by hand. It was that easy… Oh – but I still carry my trusty tire levers, just in case.

    • All Seasons Cyclist

      January 7, 2013 at 10:22 AM

      Thanks for the comments about the photos! I can remove some tires by hand, but this past Saturday I used THREE different brands of tire levers on a Kevlar beaded tire and couldn’t get it to budge! It took over 10 minutes just to get the tire off!

  12. stagewest

    January 7, 2013 at 9:38 AM


  13. Dickson

    January 7, 2013 at 9:50 AM


  14. Chatter

    January 7, 2013 at 10:03 AM


  15. Gary Galvin

    January 7, 2013 at 10:10 AM

    That is a great product! Thanks for sharing


  16. spoonfuloflentils

    January 7, 2013 at 10:18 AM


  17. Nathan

    January 7, 2013 at 10:30 AM


  18. Jack C.

    January 7, 2013 at 10:35 AM


  19. Hendri

    January 7, 2013 at 10:36 AM


  20. pushingmiles

    January 7, 2013 at 10:42 AM

    I pick 444

    – Thanks for the review. This looks like a nice tool to have on day rides! Although, I too wish it had some sort of tire lever tool. My tires are extremely tight on their rims so I don’t think I’ll be pulling those off by hand anytime soon.

    • All Seasons Cyclist

      January 7, 2013 at 8:00 PM

      Sometimes even WITH a tire lever you can barely get the tires off.

      • pushingmiles

        January 7, 2013 at 8:26 PM

        I know what you mean! My racing bike is nearly impossible to work with. It feels like the tires are shrunk on to the rims. I’ve broken a few plastic tire levers on it; now I use metal ones on that bike.

  21. Tom Robe

    January 7, 2013 at 10:45 AM

    Nice review – the CO2 inflator is a nice addition. I have been using a Serfas multi tool set that I found on the trail a few years ago. This would be a nice upgrade. My guess is 340.

    • All Seasons Cyclist

      January 7, 2013 at 8:03 PM

      It’s always nice to find bike tools on the trail! However, I’ve found more tools sitting on the ride of the road — in the past few years I’ve found hammers, pliers, wrenches, screwdrivers and nearly a complete set of socket wrenches (not all at the same time). I finally realized that most of these tools were probably dropped by people working on their cars.

  22. mynkist

    January 7, 2013 at 11:05 AM

    That seems like an awesome tool. I always enjoy all of your articles. I chose number 147

  23. isaac976

    January 7, 2013 at 11:06 AM

    I wanna be 976 as always .. 😉 awesome tool by Serfas.. I wish I could I wish I want.. Good luck guys !

  24. Erik Watson

    January 7, 2013 at 11:09 AM


  25. spokengear

    January 7, 2013 at 11:15 AM

    Loved that review. I have several pieces from Serfas and have found them all to high quality without being over-priced. Maybe it is time to ditch the frame pump!


    • All Seasons Cyclist

      January 7, 2013 at 8:06 PM

      Like you said, Serfas makes high quality products but doesn’t overcharge for them. On the bikes I use for longer distances (60 miles or more) I carry a frame pump and the CO2 inflator CO2 for speedier changes, small frame pump as a last resort).

  26. Tracy Wilkins

    January 7, 2013 at 11:23 AM


  27. Conversations With The Moon

    January 7, 2013 at 11:28 AM


  28. Josh Boggs

    January 7, 2013 at 11:52 AM


  29. anniebikes

    January 7, 2013 at 11:57 AM


  30. Gina

    January 7, 2013 at 12:03 PM

    301! Thanks as always for the informative review. 🙂

  31. skdemars

    January 7, 2013 at 12:13 PM

    Nice review – only missing the weight 😉 I’m sort of a weenie. It would also be nice to hear how the air chuck works. i.e. I have three right now and prefer those which have valve you can control over those which simply press on and allow air to flow.

    • All Seasons Cyclist

      January 7, 2013 at 8:11 PM

      I forgot! It weighs an even 4.0 ounces (114g). Thanks for reminding me — I’ll edit the article and put it in.

  32. Papi

    January 7, 2013 at 12:32 PM

    420! That’s my number. As always I love reading your blog and can’t express enough how helpful your reviews are.

  33. docsmultisportlife

    January 7, 2013 at 12:57 PM

    I have the Serfas 13i; my only complaint was the length of the Allen keys. There wasn’t good clearance when trying to adjust a saddle bolt on one of my bikes. The 17i is a tad longer and probably more convenient.
    Appreciate all the reviews.

  34. Emanuel Table

    January 7, 2013 at 2:40 PM

    200! I’m impressed by this tool. Great pictures of the product by the way!

  35. John W. Komdat

    January 7, 2013 at 2:55 PM


  36. Mike M.

    January 7, 2013 at 3:38 PM


  37. Elisabeth

    January 7, 2013 at 3:54 PM


  38. jimegli

    January 7, 2013 at 4:15 PM

    Thanks for you helpful reviews! The encouragement and insight help keep me pedaling! 287

  39. tomlet2237

    January 7, 2013 at 5:15 PM

    Nice review… Thanks! I’ve switched to the threaded cartridges, because with these I only need my inflator head, not the shell that some units require for non-threaded cartridges. With this unit we need carry one less item. But honestly though, when are these mini-tools going to stop growing? 😉



    • tomlet2237

      January 7, 2013 at 5:22 PM

      Ooops, 348 already gone. I guess I’ll be 347. If that’s legal?


    • All Seasons Cyclist

      January 7, 2013 at 8:18 PM

      My first couple of CO2 inflators were for non-threaded cartridges as well — those handle really took up a lot of room in the saddlebag.

  40. alice stribling

    January 7, 2013 at 6:20 PM

    233 !! thanks!

  41. Emilee Jane Tombs

    January 7, 2013 at 6:30 PM

    Aww wish I could enter, this looks like a great tool to have in your backpack! Alas, I am a UK resident 😦 nice review though!

  42. BikeBelles

    January 7, 2013 at 6:30 PM

    Aww wish I could enter, this looks like a great tool to have in your backpack! Alas, I am a UK resident nice review though!

    • All Seasons Cyclist

      January 7, 2013 at 6:40 PM

      I really wish I could send products across the Pond, but between the cost of postage and the Custom’s paperwork I probably won’t be doing it anytime soon. Ride safely!

  43. Dan Reinking

    January 7, 2013 at 6:34 PM


  44. Ed

    January 7, 2013 at 6:44 PM

    nice write up


  45. Rich miller

    January 7, 2013 at 7:08 PM

    I think you deserve a chance. I just put an order in for crank brothers tool. Oh well 227

  46. ecoveganhealth

    January 7, 2013 at 7:20 PM

    Thank you so much for this review, looks like a fantastic tool 🙂
    442 is my number!

  47. Roman

    January 7, 2013 at 8:00 PM

    Cool tool. I may just give up my hand pump for one of these. 397

  48. Cyclist with a roman nose

    January 7, 2013 at 8:31 PM

    CDXXIII = 423

    • All Seasons Cyclist

      January 7, 2013 at 8:37 PM

      Just have to ask — is there any significance to those Roman numerals? I know that CDXVIII represents the effort to inspire a convergence of Art, Science, and Religion — and you are just off by five.

      • Cyclist with a roman nose

        January 11, 2013 at 11:17 AM

        Hey mate…

        Interesting regarding CDXVII…
        I never heard of that.

        I was just playing with numbers and typed my guess (423) into Wolfram|Alpha:

        • All Seasons Cyclist

          January 11, 2013 at 11:22 AM

          OK, I thought there might have been some other significance to the number you chose! Thanks.

  49. Jim Hamilton

    January 8, 2013 at 7:14 AM


  50. HPat17

    January 8, 2013 at 7:49 AM

    The tool looks interesting but I wonder if it is as easy to use as it appears


  51. rich hanley

    January 8, 2013 at 8:50 AM

    441 …


  52. john witherspoon

    January 8, 2013 at 10:25 AM


  53. kwchannell89

    January 8, 2013 at 2:59 PM

    I have never seen a Co2 inflator on multi-tool before. That’s cool.

  54. Joe Espiritu

    January 8, 2013 at 3:06 PM

    413… I know you said the contest is open to U.S. residents only. I’m U.S military stationed overseas. Hopefully you can include guys like me in your contest. Thanks!

    • All Seasons Cyclist

      January 8, 2013 at 3:46 PM

      No problem — I will gladly include ANY member of the U.S. military in the contest, regardless of where they are stationed.

      • Joe Espiritu

        January 12, 2013 at 2:57 PM

        Thanks so much. I appreciate it! Thanks for your blog, as well. Ride safe!

  55. Lisa

    January 8, 2013 at 4:21 PM

    Cool tool. Going to share this! 297

  56. sarahsdoodles

    January 8, 2013 at 6:32 PM

    When it comes to tools, I’m genuinely all sorts of confused, which is ironic considering that my dad sells them for a living!

    • All Seasons Cyclist

      January 8, 2013 at 7:04 PM

      You need to have your dad show you how to use these — otherwise he will be considered a total failure as a father. 🙂 Come one, my wife taught our three sons how to do their own laundry when they hit sixth grade (and only two of them are now trained killers — thanks to the US Military).

  57. EmmaNutrition

    January 9, 2013 at 7:47 AM

    That sounds like a cyclists dream tool…not that I would know but I’m pretty sure my husband would love it! Off to search for it here in the UK 🙂

    • EmmaNutrition

      January 9, 2013 at 7:53 AM

      Nope not available here yet – like many things!!

  58. WeekdayGeek

    January 9, 2013 at 7:59 AM

    Reblogged this on Weekday Geek Weekend Adventure Freak and commented:
    This is a multi tool worth having in your back pocket.

  59. kwchannell89

    January 9, 2013 at 2:02 PM


  60. Dale M.

    January 9, 2013 at 3:35 PM


  61. WeekdayGeek

    January 9, 2013 at 9:14 PM

    cool review.. number 276 thanks

  62. WeekdayGeek

    January 9, 2013 at 9:16 PM

    p.s. i am in Australia but i will gift it to another blogger if i win.. just for fun

  63. WeekdayGeek

    January 10, 2013 at 12:30 AM

    hows’ the pugsley going now?

    • All Seasons Cyclist

      January 10, 2013 at 12:38 AM

      The Pugs is running great — but we are still begging for snow! Chicago keeps getting missed and all the snow either goes north or south of us. So far this year El Paso, Texas has received more snow than Chicago!

  64. Ben A.

    January 10, 2013 at 7:23 AM

    I mean 271.

  65. John Hamilton

    January 10, 2013 at 12:02 PM


  66. Zeus Adventure

    January 11, 2013 at 10:02 AM

    Avoiding the snow down here in South Texas, but it has certainly been a wet winter so far… for the contest I’ll take 225

  67. Laurie

    January 11, 2013 at 1:10 PM

    My husband seems to have a tendency of having mechanical issues while out on some of his rides. It is about time he upgraded his current mult-tool. I’ll guess 351.

    • All Seasons Cyclist

      January 11, 2013 at 3:02 PM

      Stay tuned — I’ll use the Random Number Generator to pick the winning number very shortly!

  68. Kayla

    January 11, 2013 at 9:12 PM


  69. Dana

    January 11, 2013 at 10:09 PM

    That is one cool tool! 254

  70. All Seasons Cyclist

    January 12, 2013 at 1:07 AM

    The winning number was 339


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Israel's Good Name

Voyages and Experiences in Israel


...finding perfection in imperfection daily.


Cycling, pro cycling, and other stories

Ferrell's Travel Blog

Commenting on biblical studies, archaeology, travel and photography


Steve Wolfgang's view of the world from suburban Chicago -- or wherever he may be on any given day

It's A Marathon AND A Sprint

And a 10K and a 200 Mile Bike Ride and an Obstacle Race and Anything Else We Find!

Shannon E. Williams

Gather. Discover. Cultivate.

the drunken cyclist

I have three passions: wine, cycling, travel, family, and math.

Long Distance Cycling Cleveland

We host a series of long distance preparation rides each weekend from January - June in the Cleveland, Ohio area


healthy tasty food that I love to make and eat and share


Diabetes, Cancer Survivor, Cycling, Photographer, Exercise, College Parent, Twins, Boy Scout Leader, Life

Travel Tales of Life

Never Too Old To Explore

Fatbike Brigade

Exploring the world on fatbikes


What happens when a medical doctor becomes a stay-at-home, homeschooling mom

Raising Jordans

early and special education


Running and Laughing through the Golden State


Inspiring Your Outdoor Adventures

Scott Silverii Ministries

Putting The Hero Back In Action


Always Thinking, Reading About, and Up To Something

Oregon Coast Cyclist

Adventures of a cyclist living in Lincoln City Oregon

A Promise to Dad

"You don't have anything if you don't have your health"

The Chatter Blog

Living: All Day Every Day: Then Chattering About It

chasing mailboxes

one good thing. washington d.c.

Fit Recovery

Stay Clean Get Fit

Nancy Loderick's Blog

Musings on technology, marketing and life.

MTB blog from super happy Tokyo girl!

~マウンテンバイク初心者女子のチャリ日記~ Play hard, Ride tough, Eat a LOT then you got nothing to worry about!


il blog di aerodinamica

Move and Be Well

Empowering others to find their balance of movement, nourishment, and self-care.

Dr. Maddy Day

Let's unpack your nutritional and emotional baggage.

Sip, clip, and go!

Cycling, off and on the road, in Western Mass

She's Losing It!

Fitness Book for Moms

Survival Bros by Cameron McKirdy


Muddy Mommy

Adventures in Mud Racing, Marathons, & being a Mommy!

wife. mother. awesome girl.

just enough ahead of the curve to not be off the road completely

A sport-loving chiropractor's blog about adventures in health, fitness, and parenthood.


Running Toward: Health, Wellness & PEACE ............................................ Running From: Insanity, Screaming Children, Housework & a Big Ass


Seizing life's joys and challenges physically, mentally, and emotionally.

arctic-cycler goes global.

%d bloggers like this: