Lukep Posted April 11, 2011 Share I have a polar and use it on my MTB and Road bike the wheel diameter I have set are MTB 2100mmRoad bike 2115mm This was done by rolling the wheel one full rev and then measuring the distance between the start and stop lines,Do these numbers sound right? Link to comment Share on other sites More sharing options...
Brakkies Sport Fotos Posted April 11, 2011 Share 2096 for the mtb, 2 bar monorails Link to comment Share on other sites More sharing options...
Lukep Posted April 11, 2011 Share Okay I run 2bar as well, I run race King back and XDX upfront.I have updated the diameter Thanks Now for the road bike 700ccx23 8,5 bar Link to comment Share on other sites More sharing options...
DomJBo Posted April 11, 2011 Share 2096 for road bike as well. for 700x23c Link to comment Share on other sites More sharing options...
Underachiever Posted April 11, 2011 Share 2100 for road bike = 23C tyres2083 for MTB = monorails at 2.3 bar Link to comment Share on other sites More sharing options...
Chain-L Posted April 11, 2011 Share easiest, inflate to right pressure, put the wheel on the floor with valve perpendicular to the floor and make a mark on the floor, sit on the bike and push forward one rotation in a staight line. make another mark. measure it, thats your diameter. Link to comment Share on other sites More sharing options...
niklasvm Posted April 11, 2011 Share my garmin calibrates my speed sensor based on gps and depending on which stretch of road its done, it varies between 2050 and 2100. I then did some time trials a few weeks ago on a computrainer and my computer always hit 40km before the computrainer did. That means the circumference is even smaller. ??? I now just leave it to recalibrate every time I start riding but the margin of error is quite small over a large distance. maybe a few km's over 1000km. Link to comment Share on other sites More sharing options...
IronTree Posted April 11, 2011 Share For Conti GP4000/Gatorskins 2096 at 110psi is pretty accuarate when tested on a distance of 100km's.For MTB I have used 2043 for Crossmaks 2.2's Link to comment Share on other sites More sharing options...
The Guy in Pink Posted April 11, 2011 Share On the road bike I calibrate by using the road chainage posts on a national road (Blue sign white writing every 200 metre) once I have set the diamenter to closest (2068 on 622 x 22) The posts are usually accurate to 1 metre but measure horizontal distance not slope distance so use a flat road. Use a 10 or 20 km piece of road. Link to comment Share on other sites More sharing options...
MTBer wannabee Posted August 17, 2011 Share HiJack on!I have just bought a simple cateye computer and the tire size chart does not have the 26 x 2.2 size. It has the 26 x 2.125 and then goes on to 26 x 2.35. So i did a little interpolation and calculated that the L(mm) should be 2074. Is anyone else out there running conti race king 2.2 that can tell me if that is correct. Hijack off... Link to comment Share on other sites More sharing options...
FC&P2C Posted August 17, 2011 Share Ive got 2111mm on my 23c gatorskins Link to comment Share on other sites More sharing options...
Keithc Posted August 17, 2011 Share Not sure if I missed the post, but what about a 29er MTB with 2.1" tyres run at 2bar. Most accurate still to roll it out? Link to comment Share on other sites More sharing options...
Shebeen Posted August 17, 2011 Share On the road bike I calibrate by using the road chainage posts on a national road (Blue sign white writing every 200 metre) once I have set the diamenter to closest (2068 on 622 x 22) The posts are usually accurate to 1 metre but measure horizontal distance not slope distance so use a flat road. Use a 10 or 20 km piece of road.assuming you can ride in a dead straight line Link to comment Share on other sites More sharing options...
MTBer wannabee Posted August 17, 2011 Share HiJack on!I have just bought a simple cateye computer and the tire size chart does not have the 26 x 2.2 size. It has the 26 x 2.125 and then goes on to 26 x 2.35. So i did a little interpolation and calculated that the L(mm) should be 2074. Is anyone else out there running conti race king 2.2 that can tell me if that is correct. Hijack off... bump Link to comment Share on other sites More sharing options...
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