Originally Posted by
skrzacik0
Hi people,
I am new here and I am a newbie with bikes etc.
I would like to know what size (diameter) or type I have in my bike.
It's Trek 3700 and the name of type is: Bontrager LT3 26x2.0".
I would like to know it, as I want to set up my new bike computer.
I can choose or 26" (650A) or ATB26x2 (650B) or I can calculate it (tyre circumference) by multiplying my diameter by 3.1416, but I wasn't sure if my tyre is 26" or ATB26" (I'm not sure what ATB means, exactly).
Please help me, thanks!
That's pretty confusing. Your bike does not (should not) have either 650A 650B or any variation of 650 tires.
http://sheldonbrown.com/650b.html
In the early days of mountainbikes, they were also called ATB's (all terrain bikes). That lost out to MTB in popular usage.
When in doubt, can't beat measuring tire roll-out, as previously suggested.