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I was going to put this under "Drivetrain" but I think it deserves a page of its own....
On this page you may see the term "Gear Reduction" and "GR" used interchangeably.
The building of GR's requires machining and welding skills and is precise work, if not done correctly you can and will tear up your engine. It is highly recommended that if you do not have the proper tools and/or skills to make the GR yourself, buy one from one of the many GR builders that can be found in the "300 Honda Club" Facebook page. There is also several different builders now selling on eBay as well. I will not list the gears used to make the GR kits, other than the 18% GR which is widely known. The gears for the 54% are also fairly easy to find with a few Google searches. Other GR's I will not list whether I know them or not, as the builder's prefer to keep this information to themselves and I will respect this.
Note:
- NOT ALL GR's are listed. Guys are coming up with new kits all the time, I can't keep up. These are some of the most common kits available currently. I may update the page as others become more popular.
- No matter what GR you have, no matter what engine combo you have backing it up - somebody will be able to find mud that will stop an aggressive 30+" tire dead in it's tracks. Period. Some mud just isn't worth driving into.
STOCK 65T BASKET 27T DRIVE GEAR
13% GEAR INCREASE
13% GEAR INCREASE
400/450 Foreman clutch/gear
400/450 Foreman clutch/gear
Increase your top speed by adding 400/450 Foreman clutch basket and Primary Drive Gear. This combo increases the final gear ratio in all gears by 13%. Will you have the top end power to use that new found gearing? This is a drop in kit, no machining required. Conversely, the factory 300 gears will work as a 14.5% GR in the 400/450 Foreman.
18%
18%
The entry level GR for the TRX300 and TRX300FW. 18% reduction in final gear ratio in ALL gears. This kit uses the basket gear from a 300EX clutch basket and the primary drive gear out of the same. The TRX300 primary drive gear must be machined and have the 300EX drive gear welded onto it.
Generally accepted for 26-27" tires depending on tire weight and aggressiveness, and engine mods.
34%
34%
Generally accepted for 27-28" tires depending on tire weight and aggressiveness, and engine mods.
54%
54%
The original big GR. Was the staple for guys running 29.5"+ tires for a long time before the bigger GR's came around. Still a very popular kit for the money.
Generally accepted for 28-30" tires depending on tire weight and aggressiveness, and engine mods.
62%
62%
Generally accepted for 28-30" tires depending on tire weight and aggressiveness, and engine mods.
75%
75%
Biggest practical GR I know of. There is bigger but some pretty substantial modifications are required from what I understand.
30"+ tires.
Gear Ratio Spreadsheet
Gear Ratio Spreadsheet
Created to help make calculating final drive ratios and gear reduction percent numbers and little easier. Simply input the basket tooth count, and the primary drive gear tooth count in the GREEN boxes and it will output the final gear ratios for each gear as well as the reduction, or increase percentage next to it.
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