Ribble winter Audax bike.

fuzzynavel

When selecting the front chainset you get the options of "170 39/52" and "175 39/52"

what do the 170 and 175 bits mean?

redddraggon

Crank lengths in mm

fuzzynavel

redddraggon wrote:

Crank lengths in mm

Sorry...technical terms go over my head...I'm still very much a newbie!

Diameter of the front crank possibly?

ride_whenever

it is the distance from the center of the axle the pedal arms spin on to the centre of the axle the pedals spin on, measured in millimeters.

stabilised

Generally longer crank arms suit people with longer legs. 170mm is pretty much the standard length, so that would be the safe bet.

fuzzynavel

stabilised wrote:

Generally longer crank arms suit people with longer legs. 170mm is pretty much the standard length, so that would be the safe bet.

So it is the length of the pedal arm basically...give or take a little bit...

passout

That's right. You'd have to be pretty tall to want 175mm. Does depend on riding style too but assuming that you are not over 6ft then I wouldn't go for the longer one. There is usually a 172.5 option too. I'd ring up ribble and ask or E-mail them.

fuzzynavel

passout wrote:

That's right. You'd have to be pretty tall to want 175mm. Does depend on riding style too but assuming that you are not over 6ft then I wouldn't go for the longer one. There is usually a 172.5 option too. I'd ring up ribble and ask or E-mail them.

Need to get the money sorted out then I will give them a call and see if they can help.

cheers for everyones help