Re: 1980 cb750 front end conversion questions

Posted by shinyribs on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1980-cb750-front-end-conversion-questions-tp4057895p4057899.html

Matching rim sizes won't affect anything. The overall diameter of the tire had no idea what size rim it's on. The reason most bikes have a larger diameter front tire ( and I think this is what you've got on your mind) is it simply rolls over things easier. That's why you see dirt bikes running really good sized 21" fronts. Some of the older models even had 23" and 25" rims.

Here's where I would be careful with mixing and matching. Whatever tires you buy make sure they are the same model. This is not very important on most rim sizes, but 17" tires are a little different. There are many different profiles ( the actual curvature of the tread when viewed from the edge, not the side) and mixing profiles can make a bike handle really funky.

See if you can get some solid specs on the front end your looking at. Length form axle centerline to top of the fork tube, fork spacing and tree offset ( center line of the fork tubes relative to center line of the steering stem).

Gonna your brief because phone. Too little offset can cause weird, lazy trail numbers. Also brings the tire closer to the bike= header clearance, tho not a big deal with 17's. And ofc the obvious ground clearance issues if the legs are real short vs stock.

Glad to help with any specific question. I've been done this road with success and mistakes. I'm no pro, but I know what to look out for and how to save $ and headaches along the way.