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Old 03-17-2011, 01:59 PM
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primusbike primusbike is offline
Motorized Bicycle Newbie
Join Date: Mar 2011
Location: nys
Posts: 16
Default Modifying G4 transmission

Can't find out what info I need without actually buying a G4. What kind of bearing does it use for the larger cog pulley? Is it just a brass sleeve, roller bearing or ball bearing?

And would it be possible to remove the pulley from the stock shaft and use a longer 5/8 rod?

Planning on having a custom made 5/8 rod that passes through the stock G4 bearing.
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Old 03-17-2011, 04:22 PM
ocscully ocscully is offline
Motorized Bicycle Elite Member
Join Date: Jan 2008
Location: Orange County, CA
Posts: 373
Default Re: Modifying G4 transmission

The last batch of 4G drives from all used a pair of #6202 sealed cartridge bearings. There have been some 2010 4G Drives available in this country (Spookey Tooth was selling them prior to their closing up shop) that came with CSX15 Cartridge bearings (these are the "One Way Bearings") You might find the Grubee Inc. website helpful
click on: to continue, total products, 4-cycle engine kits, then 4G T-Belt Drive and also the 4G Service Parts Alot of goog information and photos here but be aware Just because Grubee shows the parts does not mean that bicycle-engines will be bringing everything into this country?


Last edited by ocscully; 03-17-2011 at 04:30 PM.
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