GEBE custom drive gear

zack

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I am riding a GEBE 35cc Robin/Subaru. I am happy with the performance of a single speed. However, I want more top speed. How can I obtain/make a 16,17, or even a 18 tooth drive gear? From what I have read it must be custom machined. Where can I obtain a gear that will allow for machining to fit the 5/16-24 bore and thread?
 
Hi DT. I read where you have had experience in doing just what I want to. Thanks for the link. It is very comprehensive to the point of me being not sure which of the many gears will work. . Which gear (part number) did you find accepts machining? Any problems with machining?
 
I am riding a GEBE 35cc Robin/Subaru. I am happy with the performance of a single speed. However, I want more top speed. How can I obtain/make a 16,17, or even a 18 tooth drive gear?
What gear are you running now?

I doubt if a 17 or 18 tooth will work with your 1.6 HP motor
The 16 tooth may be too high as well

Do you weigh 100 lbs?

Try it, let us know
 
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I am using the 13 tooth gear. The top speed is 29 mph. If I pedal I can get to 32 mph. At this point the engine is at max redline. I weigh 200 lbs. I am of the feeling that I can pedal and reach a higher top speed if max redline is not reached.
 
as Forbisher suggests you may be in over the capacity of that engine.

A 6A25M015DF0906 is the 15T example in all alum. / 2 flanges.

16-18T are available too. i could only use the 15T with my GP460 on drag strip flat road, little headwind.

good luck,
steve
 
Try the 14 tooth. I think that is the highest your engine and weight will pull

DT's GP 460 had 5+HP yours has 1.6 HP and he weighs less than you
 
Thanks for the gear part number. Will aluminum wear out quickly? I understand that GEBE uses hardened steel gears.

Running out of HP is a concern, however, I am of the feeling (perhaps over exuberant) that I will be able to maintain a 32 mph speed at 6750 RPM while pedaling. I have calculated that at 25 mph the engine is at 6750 rpm. Therefore a 17 tooth should put me there (32 mph) at 6750 rpm. The question remains--will I be able to reach that desired parameter? Do you have a gear that I may be able to use/borrow to determine real application result?
 
as Forbisher suggests you may be in over the capacity of that engine.

A 6A25M015DF0906 is the 15T example in all alum. / 2 flanges.

16-18T are available too. i could only use the 15T with my GP460 on drag strip flat road, little headwind.

good luck,
steve


Steve, out of curiousity I went to the site and can not find that part # 6A25M015DF0906

I am very interested in seeing this, could you recheck this?

Thank you, Steve
 
on home page
click on "products"

click "timing belts and pulleys"

on the far right side
click on "metal timing pulleys - meteric"

click 5mm HTD
click 15 grooves
click 9mm width

2 pieces should come up, one with flanges, one without.

steve
 
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