29er Polar wheel setting

[gazza]

howdy technical guru's

 

I just finished building my new ride, a 29er, and fitted my trusty polar S520. The manual said to measure one complete rev and measure point to point less 4 mm, this should be the figure setting entered.

 

My first ride out was my normal quick koeberg sprint which measures ?28.5 to where I start and finish, however with my new 29er setting of 2895mm it was a ?23km ride   and thinking about it, I was riding quite slow too ~ so the setting is well out... how do I set this properly?

 

thanks...

 

[Genesis]

Your method and logic seems right on the button (correct), my only question is are you sure you read the measurement correctly?

Double check measurement from point to point.

Also how sure are you that it is 28.5km and not 23km?

[gazza]

Good questions, To the best of my knowledge the long loop around koeberg (start at lower car park > to melkbos gate > and all the way around > finish at car park) is ?28 k's, which makes sense because flat out I can finish in 55 min's. Also it's 28 k on my 26er with the same palor (set as a 26inch mtb)

 

I'll measure the point to point wheel rev again.