Setting up a Jr TT bike...limited tire options...put the low Crr on the back or the front?

It’s got 650c wheels so tire options are limited. I’ve got one Vittoria Corsa 2 and one Conti 4k.

I think it would be best to put the corsa on her rear wheel and the conti on her front wheel. Any opinions?

My gut reaction is the back…CRR would seem to be slightly higher due to more weight being over it.

But I would also guess that the difference is close to insignificant.

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