Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Senior Member
    Join Date
    Oct 2007
    Location
    SE, Michigan
    My Bikes
    k2 Zed 3.0
    Posts
    518
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Specialized CPro2 | CO2 Inflation, Is It Supposed To Suck?...

    After much hassle with my frame pump, I decided to pick up a CO2 kit from the LBS... I chose the Specialized CPro2 as pictured for a whopping $20 (on "sale" too).



    I brought it home, screwed in the canister. Everything looks great, no leaks. So to test it out, I deflate my rear tire, which was at 110PSI, and proceed to refill it with the CO2. I got about 80PSI out of it, until it ran out of steam. There was a slight leak around the presta valve, but there was nothing I could do about it as the adapter has no adjustments. Kind of lame; it's enough PSI to get you home / to your car (where I keep my compressor), but if you're touring, you still need to get to a real pump.

    What's the deal with these things? Am I using it right?

  2. #2
    bulletproof tiger ok_commuter's Avatar
    Join Date
    Apr 2008
    Location
    Portland, OR
    My Bikes
    Waterford 2200, Litespeed Tuscany, Salsa La Cruz, Kona Fire Mountain
    Posts
    1,934
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yep, that's it. sometimes more, sometimes less, but that's the idea.

    you can get to 110 PSI, but you'll have to use more than one cartridge.
    sic

  3. #3
    Senior Member
    Join Date
    Oct 2007
    Location
    SE, Michigan
    My Bikes
    k2 Zed 3.0
    Posts
    518
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ok_commuter View Post
    you can get to 110 PSI, but you'll have to use more than one cartridge.
    Are you sure about that? I think the actual canister can only provide ~80PSI.

  4. #4
    Senior Member
    Join Date
    Aug 2006
    Location
    Brookline, MA
    Posts
    514
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    CO2 inflators are not designed to be pump replacements. They're designed to give you enough air to get home, and that's that.

    A tire inflated with CO2 will deflate faster than one filled with air, too - if I filled up a tire with CO2 on the road, I'd deflate it and reinflate with air before my next ride.

  5. #5
    Senior Member
    Join Date
    Oct 2007
    Location
    SE, Michigan
    My Bikes
    k2 Zed 3.0
    Posts
    518
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by GRedner View Post
    CO2 inflators are not designed to be pump replacements. They're designed to give you enough air to get home, and that's that.

    A tire inflated with CO2 will deflate faster than one filled with air, too - if I filled up a tire with CO2 on the road, I'd deflate it and reinflate with air before my next ride.
    Many people who've reviewed these things claimed to get <90 PSI out of the 16 gram cartridges on 23c tires. I don't know; I feel like I should have spent my money on a better frame pump instead *sigh*. Can I ***** to Specialized?

  6. #6
    Senior Member zeo_max's Avatar
    Join Date
    Jan 2009
    Location
    Alabama, boy !
    My Bikes
    FUJI Nevada 1.0 2009
    Posts
    863
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hey guys, I was wondering if this would work better on a Mountain Bike ?

  7. #7
    Senior Member kwrides's Avatar
    Join Date
    Nov 2006
    Location
    Houston, TX
    My Bikes
    2007 Orbea Onix, 2007 Windsor The Hour, 2008 Kona Jake
    Posts
    3,199
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Servo888 View Post
    Many people who've reviewed these things claimed to get <90 PSI out of the 16 gram cartridges on 23c tires. I don't know; I feel like I should have spent my money on a better frame pump instead *sigh*. Can I ***** to Specialized?

    It works as intended. If you're looking for something to help you get in another 100 miles and are willing to pump 150 times or so, buy a frame pump. If you're looking for something to give you a quick solution to get back to your car/the start line/home that weighs about as much as a couple of quarters, get a co2 inflator. Don't blame Specialized because you bought the wrong product for your use.

  8. #8
    Senior Member
    Join Date
    Nov 2005
    Location
    new paltz, ny
    My Bikes
    kestrel talon, Ultegra group,AC sprint 350 wheelset, Trek alpha sl 2500, 105 group,Mavic ssl sl wheelset, ridley crossbow, 105 rear der, single front, Redline Conquest, tiagra group, Fuji single speed, Mongoose Mtn bike,
    Posts
    625
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I use the bigger cartridge and have no problem getting to 110 psi
    [SIGPIC][/SIGPIC]"it doesn't get easier, you just get faster"
    I have Umd on ignore, you should too.

  9. #9
    Senior Member rodrigaj's Avatar
    Join Date
    Jul 2006
    Location
    Madison, WI
    Posts
    1,126
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  10. #10
    Senior Member
    Join Date
    Mar 2009
    Posts
    179
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Servo888 View Post
    Are you sure about that? I think the actual canister can only provide ~80PSI.
    if i remember correctly, liquid CO2 at room temp sits around 700psi. with enough carts, I bet you could easily blow the tire clear off the rim and explode the tube to boot.

  11. #11
    Senior Member
    Join Date
    Mar 2009
    Posts
    179
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    correction, the one an only wikipedia indicates that its more like 1000psi

  12. #12
    SSP
    SSP is offline
    Software for Cyclists SSP's Avatar
    Join Date
    Dec 2003
    Location
    Redding, California
    My Bikes
    Trek 5200, Specialized MTB
    Posts
    4,618
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You bought an expensive lemon.

    Your inflator can only accept the expensive threaded CO2 cartridges.

    Better inflators will accept non-threaded "paintball/BB gun" cartridges which cost about 1/4 of what you pay for threaded cartridges.

    That said, CO2 cartridges typically inflate to 85-90 psi. Good enough to finish your ride, but if you want full pressure you'll need some sort of pump. I've never found the need for a frame/mini pump, however - the difference between 90 and 110 psi is negligible, and CO2 gets me back on the road much quicker than a frame or mini pump.
    CycliStats.com - Software for Cyclists
    WeightWare.com - Weight Management Software

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •