On the fence between a hardtail of flatracker. I am leaning toward the flatracker look and wanting to mount a double star 21" rim on the rear. I have a 2001 xlc and took some measurements looks like the rim should clear. I would like to know the stock axle size and which rim would work? I think I could pull it off without extending the swingarm .Thanks for your help. Curtis
Remember when taking measurements of the swing arm clearances to add some for tire expansion at speed. Centrifugal forces make the tire get a bigger circumference.
While laid off I worked on a Ninja 750. The kid that owned it put a bigger rear tire on. It had a good inch of clearence, but the tire still burned thru the plastic fender. Took some explaining to get the kid to understand.
1986 XLH 1100 (fixer-upper) // Engineers design things, Technicians make them work. --- 30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck .
I've seen it on other Harley's but never yet on a Sportster. A wheel that tall will raise your seat height unless you make other changes.
My old Vincent had a 19 on the back, and a 20 on the front, as the designers believed that more or less equal sized wheels (the rear tire was slightly wider) gave better handling.
A machine's form is a product of it's function, and what WORKS best IS best.