A tape measure should sort you out, just set up the road bike identically to the fixed bike. I think if you're any any issues related to fit, you can't afford not to have it attended to professionally, it's a better investment than any other bike related purchase and often cheaper than blindly experimenting.
A tape measure should sort you out, just set up the road bike identically to the fixed bike. I think if you're any any issues related to fit, you can't afford not to have it attended to professionally, it's a better investment than any other bike related purchase and often cheaper than blindly experimenting.