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?
 

zack

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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?
 

MotorBicycleRacing

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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?
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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zack

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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.
 

DetonatorTuning

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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
 

MotorBicycleRacing

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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
 

zack

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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?
 

s_beaudry

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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
 

DetonatorTuning

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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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