wheel size

[filmermikey]

would there be any downside or benefit to using a smaller rear wheel than front? 18 in the rear and 21 up front

[RidgeRunner]

     Changing either end from stock?  If so, it could have the same effect as changing the steering head angle and thus the rake/trail.  Advantage or disadvantage would depend on what the bike might need to improve high speed handling.

                           Ed

[Seldom Seen Slim]

Wow -- not many folks are from Glendora - a tiny town in southwest Michigan.  I used to live about 20 miles from there.  Welcome to the Forum.

[Elmo Rodge]

Wow -- not many folks are from Glendora - a tiny town in southwest Michigan.  I used to live about 20 miles from there.  Welcome to the Forum.

Yeah. Probably one less lives there than you think, Slim.  Wayno

[Seldom Seen Slim]

With tongue well-planted in cheek -- I agree, Wayno.

[filmermikey]

Wow -- not many folks are from Glendora - a tiny town in southwest Michigan.  I used to live about 20 miles from there.  Welcome to the Forum.

haha well i actually live in the glendora in southern california

[filmermikey]

     Changing either end from stock?  If so, it could have the same effect as changing the steering head angle and thus the rake/trail.  Advantage or disadvantage would depend on what the bike might need to improve high speed handling.

                           Ed

well its a completely custom build

[Jessechop]

Really shouldn't matter. Many bikes come stock with different size front to rear, heck you could go from a 21" front to a 16" rear on a bone stock Harley many years. Now, outside diameter of the tire could matter if you got carried away with it, but then again with a full on build you should be able to compensate for said changes.

[Seldom Seen Slim]

Mikey, I kinda could have guessed that you don't live in Michigan -- but was making the point that not everyone knows that there's a Glendora in California.  You put the name of the town in your profile -- but didn't list a state.  Maybe now you'll add that tidbit of geography to the profile page.