setting of wheel size

[hagar]

Morning Hubbers

 

could someone tell me the best way to set my wheelsize on my bike computer. I cant seem to get the distances right .

 

sunday i rode 100 km tour medallion .

 

pc showed 91,79km almost 8 km short.

 

i have calculated the wheel size by taking the circumference of the wheel and used that(2103 mm) the owners manual says 2133mm.

 

any suggestions .

 

I have a ciclosport hac4 pro plus

thanks

[casspir]

Hagar,

 

First of all, the Medallion was 95Km.  That is from start line to finish line.  Not mats to mats.  I made a mistake to stop my Edge just after the finish line. 

 

I used to make a mark on the garage floor (with the valve stem at 6 o'clock) and slowly roll the wheel forward until the valve stem is at 6 o'clock again.  Difference between markings about wheel diameter.  You can also subtract a small amount to compensate for tyre pressure.

 

Easiest of all, get  a Garmin Edge.  GPS technology and no further worries. 

 

Regards,

 

casspir

[hagar]

thanks casspir i did that with the marking on the floor . Yea i think that i must get one of those garmin things.

 

Anyone want to buy a ciclosport hac4 ???

[johnw]

double check what wheel size you entered into your ciclosport hac4 pro plus. If you made a mistake and entered 2013 (instead of 2103) this would explain the difference. At 2013mm for 456 wheel revolutions you get 91.79km. At 2103mm you get 95.89km which seems to be the correct distance as per the Garmin

[hagar]

will do thanks

[Brakkies Sport Fotos]

Ek dink die polar ouens gebruik 2096 as wiel omtrek.