Originally Posted by
houleskis
On cranks & cadence: I only have a 5mm difference - 165 track vs 170 road
Only a 5mm difference?
Again:
Cranks come in 2.5mm increments for a reason.
The common Track and Road crank lengths are:
165.0mm
167.5mm
170.0mm
172.5mm
175.0mm
165mm and 170mm are 2 sizes apart. This is not insignificant. The footspeed (going in a circle) required to maintain the same cadence between the two is different.
I'm not going to offer advice on what you should do. I just want you to know that your crank lengths are very different. Like the difference between a small and medium sized shirt.