Grizzly Guys and the Famous JBS Sheave

So it seems like even the guys on the Grizzly Central are fighting about the best sheave.


It's a big stink about Coop vs JBS. I can't 100% compare apples to apples, but I had a Coop sheave on my Grizzly 550, and my buddy had a Coop sheave on his 700 (this was pre-JBS days), and it was nowhere near the difference in low end power as the JBS sheave on my Rhino. The Coop sheave with the cut and welded cam plate was good for top end in low range, but overall low end gain wasn't the "OMG" night and day difference you get from a JBS sheave on a Rhino. In fact, I even put a 1mm shim in after the Coop sheave, and still wanted more bottom end power.

I don't know all the magic or the physics behind the different schools of thought concerning sheaves, but I can say that the JBS sheave is where it's at. Count belt ratios all you want, I'm past bench racing those numbers. You'd think a 27% or greater reduction in the starting ratio of the Coop sheave would be in your face and awesome and low. It was not. I no longer recommend Coop's machined sheaves to my Grizzly buddies, and have not recommended his work for a long time. When we get to talking about clutches, I say that I have three words:

Hot Rod Style

thanks chris!!!..

Nice write up Chris, I totally agree. I went over there and read the whole thread . That fastchevyls1 guy was pretty cool to turn around and say he screwed up and not James.

Yea that takes A bigger person to admit when they wrong good for him you have to gain a little respect for someone when they can do that.

They're eyes have been opened to a hole all the outside possibilities of the sheave, JBS guru! Will guide you.

Some people once they have established their loyalty to something or someone close their minds to any new ideas or things. Everyone who has used James stuff knows what it can do and it's not just the parts its the service too.

The REP in this case is earned and deserved.