Lukep Posted April 11, 2011 Posted April 11, 2011 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?
Lukep Posted April 11, 2011 Author Posted April 11, 2011 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
Underachiever Posted April 11, 2011 Posted April 11, 2011 2100 for road bike = 23C tyres2083 for MTB = monorails at 2.3 bar
Chain-L Posted April 11, 2011 Posted April 11, 2011 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.
niklasvm Posted April 11, 2011 Posted April 11, 2011 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.
IronTree Posted April 11, 2011 Posted April 11, 2011 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
The Guy in Pink Posted April 11, 2011 Posted April 11, 2011 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.
MTBer wannabee Posted August 17, 2011 Posted August 17, 2011 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...
Keithc Posted August 17, 2011 Posted August 17, 2011 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?
Shebeen Posted August 17, 2011 Posted August 17, 2011 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
MTBer wannabee Posted August 17, 2011 Posted August 17, 2011 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
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