Comstars on Hayabusa forks

Has anyone been able to fit Comstars on 99-07 Hayabusa forks? I've searched around a good bit and I can't find a definitive answer. I may just run the Busa front wheel as it's only an inch smaller. I'll have to tackle the spedo issue in running that setup, though.

if you have access to a machinist it is very simple to swap any wheel lashup
the bigger issue is the shortness of those type of forks and the increased trail,unless you address those problems it is not really an "upgrade" , only a fashion show

I second what xb33bsa says....if the fork offset is enough to counter-act the difference in length, keeping trail where it should be....the fitting of a wheel is "simple" but for sure not the cheapest endeavor.

for starters, the brakes on GSXR's are either 320mm or 300mm, depending on the year and model. the rotors are generally 5mm or so, some 4.5mm thick.

A honda/comstar is going to have I think 280 or 290mm rotors, 7mm thick. the offset from the centerline of the wheel will also be different. All of these issues can be taken care of with a rotor adapter that bolts to the wheel, sets the correct offset, and bolts on the proper rotor.

for axle, you have a couple options. If you want to retain the comstar speedo drive then you have to build a custom axle and spacers. I did all of this for an xs750 so I'll show you how I did it.

stock axle below, my axle above and spacers above (converts 17mm axle to 30mm axle mounts)











welded a "L" tab to the loose spacer so once pinched into the fork lower it holds the speedo drive as the stock fork did. The length of the sleeves on the custom axle double as the spacers to center the wheel.



and how I dealt with the rotor problems

the often overlooked problem with shorter forks is the loss in lean angle/cornering clearance there isn't any vintage bike that can afford to be lower,that is if you are really gonna ride it

I appreciate the advice! I suppose this build is an exercise for knowledge if nothing else. The more that I think about it, the more I'm leaning toward a Hayabusa wheel.

CB750 stock 110/90 - 19 gives me a diameter of 26.8" and 753.1 revs/mile.

Hayabusa stock 120/70 - R17 gives me a diameter of 23.6" and 854.5 revs/mile

~3" lower for wheel/ tire height + ~2" in fork height will bring the front down considerably, but I believe it will correct the dramatic rake that the bike had to begin with.

Truthfully, I do like the cosmetic look of the gold Busa forks given my OD green tank. The primary benefit is that I'll be getting dual discs and upgraded suspension in addition the the cosmetics.

actually you will be losing only 1.5" in height from the wheel swap,+ the 2'' of the fork...
still 3.5" is a lot when you should actually be slightly raising the bike front and back, but, i guess you know ,that it will only be a blvd cruiser not a corner carver

xb33bsa said:

actually you will be losing only 1.5" in height from the wheel swap,+ the 2'' of the fork...
still 3.5" is a lot when you should actually be slightly raising the bike front and back, but, i guess you know ,that it will only be a blvd cruiser not a corner carver

Click to expand...

100% on point in all aspects. I'm a better mechanic/ fabricator than rider...

you mean like this

18 inch gl1100 front wheel and close to 600 in material and machining

I'll just see what works for my build and get back to y'all. I'll probably go with the Busa wheel at first.