The P2/3/5 in size 61 has a front centre of 658mm, and a BB drop of 75mm. If my Pythagoras understanding is right, that means that the horizontal distance between BB and front wheel axle is (658^2 - 75^2) ^ 0.5 = ~653.7mm.
The ITU rules say:
There will be no less than 54 cm and no more than 65 cm between a vertical line passing through the center of the chain wheel axle and a vertical line through the center of the front wheel axle.
Does that mean the size 61 is not legal, or am I misinterpreting / miscalculating something? It seems unlikely that Cervelo would have designed the geometry to be 3.7mm outside of the ITU rules...
It looks like USAT have an exception to this rule based on saddle height, to avoid catching tall athletes, but not BTF in the UK, as far as I can see.
The ITU rules say:
There will be no less than 54 cm and no more than 65 cm between a vertical line passing through the center of the chain wheel axle and a vertical line through the center of the front wheel axle.
Does that mean the size 61 is not legal, or am I misinterpreting / miscalculating something? It seems unlikely that Cervelo would have designed the geometry to be 3.7mm outside of the ITU rules...
It looks like USAT have an exception to this rule based on saddle height, to avoid catching tall athletes, but not BTF in the UK, as far as I can see.