Cork-Spotters

Just last week I got a new Kelly's Axis hybrid bike, and yesterday I bought a Raleigh 16 Function wireless cycle computer for it.
My problem is that the tyres on my bike (700x38C 40-622) are not listed in the instructions with a code to put in the computer...
What is listed is:
26.6" (700x25C) ------ 2124
26.8" (700x28C) ------ 2136
27" (700x32C) ------ 2155
28" (700B) ------ 2237

Is it possible to figure out manually what code my bike would need? I've tried with a calculator to look at the ratios but that doesn't really work.
Any help is greatly appreciated. TIA.

Cork-Spotters

bmorey

The 'code' is just the wheel circumference in millimetres. To measure your wheel make a chalk mark on the ground and line up the valve with it. Sit on the saddle and walk the bike forward until the valve is again dead bottom - make a chalk mark. Measure distance between chalk marks in mm --that's your code.

You don't really have to sit on the bike but I believe it improves the accuracy by a fraction.

Cork-Spotters

Thanks for that, I've got it sorted now.