there isn't a crank length inspection booth at the entrance of velodromes that i'm aware of...
There certainly isn't in Glasgow.
It's pretty unlikely anyone is going to spot 170s (or even 175s) over 165s purely by eye* but if you're polite you'll ask me if your bike is ok to use on the track the first time you bring it, in which case I'll probably look at crank length and if I see 170s or 175s (I've allowed both on the track) I'll remind you of how steep our banking is and ask that you keep your speed a little higher in the the turns.
HOWEVER, I'm pretty open minded and easy going, a lot of the 'old brigade' of track cyclists (ie coaches, commissaires etc) are not.
*I have spotted long cranks by eye when my attention has been drawn to them due to other factors: rider has clipped a pedal in the banking, rider using combo of long cranks and low bb so even on straights the ground clearance has looked 'wrong' etc.
TLDR - Don't shout about your long cranks. Don't use long cranks unless your frame has the bb height to do so. Don't draw attention to yourself. Don't be surprised if some busybody somewhere eventually pulls you up for them.
There certainly isn't in Glasgow.
It's pretty unlikely anyone is going to spot 170s (or even 175s) over 165s purely by eye* but if you're polite you'll ask me if your bike is ok to use on the track the first time you bring it, in which case I'll probably look at crank length and if I see 170s or 175s (I've allowed both on the track) I'll remind you of how steep our banking is and ask that you keep your speed a little higher in the the turns.
HOWEVER, I'm pretty open minded and easy going, a lot of the 'old brigade' of
trackcyclists (ie coaches, commissaires etc) are not.*I have spotted long cranks by eye when my attention has been drawn to them due to other factors: rider has clipped a pedal in the banking, rider using combo of long cranks and low bb so even on straights the ground clearance has looked 'wrong' etc.
TLDR - Don't shout about your long cranks. Don't use long cranks unless your frame has the bb height to do so. Don't draw attention to yourself. Don't be surprised if some busybody somewhere eventually pulls you up for them.