Cheaper GEBE pulley supply

grinningremlin

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#1
Found this looking for a better/cheaper supplier of the drive gears for the GEBE.GEBE charges $34 for each gear, which seems WAY too high to me.Granted, you'll have to do a little home machining, file some flats, and tap/thread the inner bore, but $12 sounds a lot better than $34.And GEBE states their gears are file hard, they lie, a cheap hacksaw goes through them like butter, but it's a quick way to get twice the life, cut off the end, flip the gear and use the cut off end as a locknut.
http://www.amazon.com/5M12X9-Ametric®-Timing-Diameter-Overall/dp/B00DHIW2RQ
 


darwin

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#2
There's a cheap Chinese knockoff of the GEBE kit out there, can't remember where I saw it. Parts must be out there too.
 

darwin

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#3
Livefastmotors has a GEBE clone kit coming, dunno when. Might also try whizzer parts, must be some knockoffs out there. I think whizzer is where I remember the idea of GEBE parts.
 
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#4
Got three 12 tooth pulleys from Ametric today, of course they're repackaged Chinese timing pulleys.Here's something neat, they look better built than GEBE's.Gebes are polished and these are dull metal, but all the edges are well chamfered.The flanges on the GEBE gears are always slightly mobile and the Ametric ones look like they were press fit.Have to do some threading and grinding, but I've got pulleys to spare.
I saw that livefast has a new belt-drive coming, if it's a cheaper option it's bye bye GEBE.
 
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#5
now if a #13 or #14 alternate source could be found. The #14 has been out of stock from GEBE for awhile. When I inquired via email, all I was told was that it would be available sometime in the spring.
 
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#6
How are the cops in Austin?I used to live austin/san marcos and am curious about riding while visiting.
Ametric should have 13-14 gears, I inquired about 11's but no reply.Cutting your own thread is hard work, but still worth it.
 
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#7
this is the 5th year i've been commuting by motorized bike and I've never had a problem with law enforcement. then again i keep it under 20 mph, wear a helmet, and run with head / tail lights. my daily commute is longer than most @ 28 miles daily, 6 days a week so i see / am seen by lots of cops daily.
 
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#8
this is the 5th year i've been commuting by motorized bike and I've never had a problem with law enforcement. then again i keep it under 20 mph, wear a helmet, and run with head / tail lights. my daily commute is longer than most @ 28 miles daily, 6 days a week so i see / am seen by lots of cops daily.
Good Point CPUAID, It is usually the kids doing something stupid like riding on the sidewalk, pulling out in front of cars, not using hand signals, unable to stop because of poor braking and SPEEDING that draws the attention of the cops or someone complaining to the cops.... Dan (ex-state trooper)
 
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#10
ok grinningremlin, i'm going to put you on the spot now. any details on how you were able to tap the 5/16-24 thread dead center down that bore? did you hand tap or use a drill? i've located a 5M14X9 and a 5M15X9 HTD timing pulley, also from Ametric, and need some guidance since they weren't that cheap and i don't want to muck them up. worst comes to worst i'll take it to a machine shop but prefer to do it on my own because i plan on experimenting with different gears/engines. i was not able to find anyone that has used a #15 gear for the GEBE and was wondering if it was even advisable. my plan is to mount my Mitsubishi TLE-43 or Tanaka PF-4000 with the #15 gear. comments anyone?
 
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#11
ok grinningremlin, i'm going to put you on the spot now. any details on how you were able to tap the 5/16-24 thread dead center down that bore? did you hand tap or use a drill? i've located a 5M14X9 and a 5M15X9 HTD timing pulley, also from Ametric, and need some guidance since they weren't that cheap and i don't want to muck them up. worst comes to worst i'll take it to a machine shop but prefer to do it on my own because i plan on experimenting with different gears/engines. i was not able to find anyone that has used a #15 gear for the GEBE and was wondering if it was even advisable. my plan is to mount my Mitsubishi TLE-43 or Tanaka PF-4000 with the #15 gear. comments anyone?
It wasn't easy.First had to grind flats so the vise would hold it.Then I started with some fine diamond coated dremel bits, worked up to some larger rougher diamond bits, finishing off with a regular metal bit, (all on a drill press) and opened it up enough for a hand tap.The hand tapping was my first attempt at anything this hard, and I could see the bit twist a little, but I got it through, finished with a little steel wool and the bit, it's ugly but it works.
It would be FAR easier to have a shop do the final tapping, or invest in a good bit set meant for this type boring.To sum up, it took a long time, a lot of work, and I can see why they're $32,.... but I'm still glad I can do it if needed.
 

butterbean

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#12
GG, question. What diameter are the gebe sheaves? I need a pulley that closely matches my current ratio. The output gear and the final gear (excluding the clutch and input gear) come to 4.8:1, with the final drive being 12.44:1. Knowing the diameter of the gebe sheave will tell me what size pulley I need for the output gear to match the 4.8:1 (or closely match) of my current setup. I'm going to do a two-speed manual by controlling the belt tension with a spring-loaded tensioner and a clutch lever (locked position gives one tension while engaged position gives another, one will be hill climbing gear and the other will be cruising).
 
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#13
approx. 16" across from one side to the other. the way i measured was from the bottom of the sheave channel where the belt seats
 
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#14
grinningremlin thanks for the info. i knew it didn't look as easy as it sounds. i bit the bullet and ordered the 5M14X9 gear, $18.20 shipped. so far i have called around 2 machine shops locally and no one wanted to do it. i may have to trial and error it on my own.
 
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#17
Toothed belt, though I don't think it would matter much sheave-wise it would just slip a bit.Cpuaid, did you get it from Ametric? They state they can thread them, though they don't quote extra cost, and have yet to reply to my inquiry.
 
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#18
Cpuaid, a couple tips:
Use an old GEBE belt wrapped onto the gear (pliers or vise-grips) so you can do the initial flat grind, or anytime you are in danger of marring teeth.I don't know if you're metal shop savvy, so not to be condescending:
Oil drip for boring/drilling/tapping just need a little
Take it slow
Tapping technique, tapering the opening after boring and before tapping, go until bind is felt, back off until you feel the ribbons "crack" then a few more in.Clean out often.
It's almost impossible to get the hole crooked if you work up in size incrementally.

Far left untapped, middle hand ground/tapped, right GEBE pulley.No need for polishing, the system does it on the road.
 

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butterbean

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#19
What I need is a clutch bell for a belt-drive. I can swap out my existing clutch bell for one with a belt pulley and put a 9 tooth gear on my crankshaft and a 22 tooth input gear, then swap my output gear for my belt-driven clutch. This should work perfectly and be very close to my current ratio.
 

butterbean

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#20
Got it almost all figured out, just one last question. Can I file down the teeth on the gebe sheave to use a v-belt? I found a belt pulley clutch for 5/8 shaft and with a gebe sheave my cruising ratio would be 12:1 exactly, which is fine.
 

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