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Thread: Gbc x rex tire size q?

  1. #1
    Join Date
    Dec 2011
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    Omaha Ne
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    90

    Gbc x rex tire size q?

    Just wondering, i have the x rex's & love them for racing xc. But the fronts are 21's but measure a bit under 20" & the rears are 20's & measure a bit under 19". Do all tires measure like this such as the holeshots & razr's? Just wondering if i should go with 23" f & 22" rear for the ruts. I figure those would measure out at just under 22" & 21" respectively. Thanks for the input!

  2. #2
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    Jul 2009
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    Maxxis is usually spot on the holeshot gncc i know are about .5" short and the fronts about that much taller i know gbc has a short problem maybe a 22/22 set up
    02 Warrior
    Lonestar, Elka, Houser, Yoshimura, American Star Racing, Flexx
    04 Crf50

    ohiomafiariders.com

  3. #3
    Join Date
    Jun 2010
    Location
    Blairsville, PA
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    169
    I ran into size variances way too much when i was into my 4x4 lifted 29.5" tire phase. Some sizes are off well over an inch either way, i would call companies yourself and ask for an exact measurement but dont let on what size you want to hear, make them be honest about it. i know my GNCC's run short, front and rear.
    1999 400ex -- Sunday driver ----****SOLD****
    Wiseco 426. 11 :1, Hotcam Stage 2, Curtis Sparks X-6 full exhaust, Houser 450r Probounce nerfs. (black silvervein) Holeshot GNCC's on T-9 Itp baja, Maier carbon fiber plastics, Houser antivibe stem with Renthals/ODI Rouges, Lonestar doublerow carrier, 170 main no lid -- 50/50 turbo blue and 93. '07 450R shocks

    2005 450R -- The Sleeper --
    Bumped up compression, stage 2 hotcam,hotrods bottom, Dasa full system, uni filter and jetted, stainless brake lines, rath nerfs and heels, quadtech hood, Fluidyne radiator, ported and polished, houser grabbar, Hinson'd out.

  4. #4
    Join Date
    Aug 2008
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    Central NJ
    Posts
    11,326
    GBC tires are slightly smaller than usualy, about a 1/2 inch to an inch overall.

    Id email gbc and see what they say.
    If it's stupid, and it works, it isn't stupid. - Murphy's Law
    2000 426EX,sold
    2004 450R WIP
    -Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
    400EX Frequently Asked Questions, CHECK HERE FIRST!

  5. #5
    Join Date
    Jun 2010
    Location
    Blairsville, PA
    Posts
    169
    It could simply be how a company measures. Top of tread, or actually OD of the carcass. Interco and itp i know always run short. forinstance a vampire edl is 28" advertised, It actually measures a hair under 27" but has 2" deep lugs. Any highlifter outlaw tire is dead nuts to the ad brand new around the tread blocks.
    1999 400ex -- Sunday driver ----****SOLD****
    Wiseco 426. 11 :1, Hotcam Stage 2, Curtis Sparks X-6 full exhaust, Houser 450r Probounce nerfs. (black silvervein) Holeshot GNCC's on T-9 Itp baja, Maier carbon fiber plastics, Houser antivibe stem with Renthals/ODI Rouges, Lonestar doublerow carrier, 170 main no lid -- 50/50 turbo blue and 93. '07 450R shocks

    2005 450R -- The Sleeper --
    Bumped up compression, stage 2 hotcam,hotrods bottom, Dasa full system, uni filter and jetted, stainless brake lines, rath nerfs and heels, quadtech hood, Fluidyne radiator, ported and polished, houser grabbar, Hinson'd out.

  6. #6
    Join Date
    Dec 2011
    Location
    Omaha Ne
    Posts
    90
    I just measured them properly inflated & they are both 1" shorter than marked on the tire.

  7. #7
    Join Date
    Aug 2008
    Location
    Central NJ
    Posts
    11,326
    How old are the tires? The gbc website says they are actually bigger than 21"

    http://www.gbcmotorsports.com/xrex-p-129.html
    If it's stupid, and it works, it isn't stupid. - Murphy's Law
    2000 426EX,sold
    2004 450R WIP
    -Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
    400EX Frequently Asked Questions, CHECK HERE FIRST!

  8. #8
    Join Date
    Dec 2011
    Location
    Omaha Ne
    Posts
    90
    I got them from kgmotorcycles last february. I just emailed GBC about it. Hopefully they will respond quickly. I should of asked them at the heartland challenge...

  9. #9
    Join Date
    Sep 2007
    Location
    ky
    Posts
    1,013
    i found a old worn out set of regular itp hole shots in my shed. they are 20's with maybe a quarter inch of tread left, and they are like a half inch taller than my rear 20 inch xrex's

  10. #10
    Join Date
    Jul 2010
    Location
    Meadville,PA
    Posts
    2,984
    Originally posted by d90rick
    I got them from kgmotorcycles last february. I just emailed GBC about it. Hopefully they will respond quickly. I should of asked them at the heartland challenge...
    same here. love the tire though so i cant complain
    XC 08 450r

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