Silly Sprocket Question...

So I only rode my KZ stock about 2 miles and never went above 35 because the brakes didnt work on the way (fun ride let me tell ya) any way I have done a ton of mods since then and I changed the drive to a 535 from a 630 and went to a 17T front and 39T rear sprockets. Heres the question at about 55 mph I am running about 3500 rpm. Is this normal high or low? It feels awful high to me but before I go lowering the rear and raising the front I thought I would get some feed back...

I've used www.gearingcommander.com when I did my sprocket gearing changes.

That site is outstanding I wish I would have known about that years ago thank you so much!

Great link. Thanks!

Hey what front end are you using? Forks, triple trees ect.

Your sprockets give a ratio of: 39 / 17 = 2.294
I have experimented with different gearing on my 650, and found that 2.357 (33 / 14) is about as high as I can go without laboring the engine at 70 + MPH. That is with a 140/90 x 16" rear tire. Mine does 4,220. at a true 55 MPH, verified with a GPS.

I would think that at a true 55 MPH you would be turning about 4,350 RPM. The higher RPM is due to the smaller diameter of your rear tire as opposed to mine. I guessed that it is a 180/55 x 17.

If you have a 1000 cc engine, you might be able to go a little higher - If you are only interested in highway cruising, but it would not be worth changing sprockets. So in summary, I think you are geared as high as practical right now. If you want acceleration, then go smaller on the front and or larger on the rear.

jayw704 wrote:

That site is outstanding I wish I would have known about that years ago thank you so much!

Hey what front end are you using? Forks, triple trees etc.

Front end, triple tree, front and rear brakes, wheels, rear sets, clip-ons, levers and fluid reservoirs a all from a zx7r 91-95 rear wheel and brake took some modification but the with a steering head bearing change the steering bolt and triple tree bolted right on!

jayw704 wrote:

Front end, triple tree, front and rear brakes, wheels, rear sets, clip-ons, levers and fluid reservoirs a all from a zx7r 91-95 rear wheel and brake took some modification but the with a steering head bearing change the steering bolt and triple tree bolted right on!

I like it! Ive been wanting to do some changes like that to my 77 1000 now I know what direction to start in. What steering bearings did you have to use? Do by some strange chance have the part numbers of the bearings?

Hi.I'm running two z1000,s (both 1075 wiseco) with 17" zxr wheels. First one (z1r) is spot on running 17-33 gearing with 630 pitch and the other (Drouin) runs 18-40 with 530 pitch but could do with going to 19t on the front.

Those are both some pretty sweet bikes you have there!!! What are the big contraptions on the side on one it looks like fuel injection? and on the other a hyd. shifter? Please do tell...

Those look like they have a belt driven supercharge setup?