850s eat the stockers for breakfast ! both of ours have broken them. getting ready to do one soon, have used the doo docs in the past. if I can't get hold of him, I may try GBoost Rhinos. Good luck !

 

Hi torque rollers are the only way to go in my books. Been around and proven forever...there's a reason they're the ones C&T, GnR, etc all stock.

Incredible service and amazing product - Hi-Torque Rollers Products

Putting them in both of my new sleds, my friends new sled, and my other two friend's new sleds...don't like doing long trips with people that don't have them because the stock are so prone to breaking.

 

Had an 850 in our group break them at 3000 miles......interestingly enough it was coming out of a corner.
Im sure the sled was backshifting and my buddy whacked the throttle.
At the expense of losing a weekend good to replace.

 

Do the aftermarket ones show any performance improvement or just the durability. ? TY

 

Depends. The Hi Torque ones have a minor but noticeable performance improvement, because the roller no longer rides directly on the secondary. Instead they have a small raised / hardened lip that rides on a hardened steel washer. So there's much less resistance on the roller to, well, roll.
We're talking a couple of % here, but it is there.

 

Hi-Torque rollers hands down. I run them in all my sleds and install them for day one. Have seen way to many stockers fail.

 

Ordered mine from Hi-torque rollers last week. My ‘21 has about a 1000 miles on the stock ones, and for peace of mind I figured I’d change em out. They should be arriving within a few days. Great folks for sure. Had them in my sidewinder too…no worries with those. A quality, and Very well made product.

 

Primary rollers or secondary, just clearing up what you have ask?

 

Secondary

 

Another vote for Hi-torque. I try to get anyone I ride with that has a qrs to put them in.

 

The OEM secondary rollers are very hard and brittle. This is a double edged sword. Hard and brittle makes them easier to rotate but more prone to breaking.
When you change from forward to reverse and you hear the well known "clunk" - this is the sound of the heilx changing direction and reconnecting to the rollers. Backshifting is also a possible cause. Once this has happened enough the brittle rollers split in half. If the sled loses a roller and you continue to ride the steel stud that the roller rides on can and will damage the helix.

 

I agree and I have just installed hi-torque rollers purchased from you (C & T) in my 2019 MX Z XRS850. Stock ones broke right in half at 2200 miles. I installed a set in my 2018 MX Z XRS850 last year bought them from C & T as well. Great product and great vendor for sure!!! I also bought the HD tool to remove brake caliper mounting bracket from drive axle. It worked perfectly.

 

The stock secondary rollers are junk..mine failed in my 850 at under 2000 miles.
I replaced with Hi Torque.
I bought a spare set for my other sleds that still have the stocks rollers

 

don't know anything about doos 4 strokes. do they use the same qrs driven ? if so, do they also break rollers ? if they don't, then it looks like the rer may be to blame. I'm sure the heat produced by my belt chewing 850 doesn't help matters. seems like some kind of cushioned pocket for the reverse notch might help. we've had 2 blow rollers, one going back and forth in a tight situation, the other on a lake run after lifting, then getting back on it. so i guess it could be both rer and backshifting. I know that a lot of jumping is also a cause. so, if you drive slow, never use reverse, never jump the sled, the rollers will last forever. that doesn't sound like any fun !

 

Belt deflection set too loose is another culprit of the broken rollers. Having it too loose allows the clutch to slam into the belt and that jolt is transferred to the driven rollers.

 

There is 2 ways the rollers break and both are operator error. 1-Harsh transition between forward and reverse. 2- locking up your track and then nailing the throttle with out coasting first to let the secondary shift to the correct ratio.

 

True but the stock rollers are notorious for breaking in half. Most of the top mountain riders replace them with hi-torque rollers right away many before even riding the sled with stock rollers. It's not fun getting stranded in the mountains with broken rollers lol

 

When i come off of reverse i always hold the brake until the rollers are in their spot...you can hear a small clunk ...never broke a roller yet and im not easy on the machine at all....

 

I have found the primary rollers wear just as fast as the secondary. Hopefully all you guys are checking them. 2yrs and they are smoked.

 

I remember when the P Drive was touted as so smooth and efficient, that it was touted as being virtually maintenance free. I guess that was a lil bit of a white lie huh? Lol.

 

Just picked up my 2022 XRS 600R MXZ, do the OEM rollers last longer with the 600 vs the 850?

 

Nope. Has nothing to do with how strong the engine is - by the time it gets to flex its muscle, they're already engaged. The issue is that with the helix, as you let off the throttle and then get back on it (or reverse and then not reverse, or brake to a stop and then accelerate again), the roller smashes into the helix. The smashing causes it to eventually break. So the rollers in an 850 that's driven hard and doesn't let off or reverse, will out last the rollers in a 600 that's driven easy but brakes / reverses a lot.