deciding

I recently bought a old kosman I think 18" rear rim. I have a chance to get an almost identical match for the front but it's a 17" front rim. Am I going to have any issues with this setup? Is there anyone with this setup that can advice me what to do ? My concerns are speedometer handling ect...

Thank you all for this Forum. I will be researching for 2-3 months to pick my Vmax, I will try to spend around 4k+/- which appears to allow a wide range of years to choose from, the only tech thing I have noticed is that in 93' the forks were beefed up for stabilization at high speed. I see alot...