RK Racing ChainGB520MXU-120 (520 Series) Gold 120 Link Extreme Performance Narrow Clearance Off-Road and ATV UW-Ring Chain with Connecting Link

After extensive research on all the chains currently available (2015) from DID, EK, RK, Tsubaki, Regina, Renthal and ProTaper, I have this chain on 3 bikes now. It is the most appropriate chain I can find for dirt bike use, from 125cc 2 stokes up to 450cc 4 stroke motocross bikes. It's narrower and lighter than any other high quality 520 sealed chain I know of and stronger at the same time. Check the specs! Rolls very freely for a sealed chain, even when cold. Rolls even better when warmed up like all sealed chains. I used to be a DID only guy. Their prices have become prohibitive for their best chains. I tried a DID VX2 and was very unsatisfied with the gold coating. It rusted just like a bare steel chain. I've switched to this "gold" plated RK MXU now and they have been great. I've used it on KDX and KTM 200's and 250's, all 2 strokes. I haven't had any issues with stretch or rust. I now lube my chains with cheap 90W gear lube to prevent rust on the outside after washing the bike just to ensure they don't rust, but for comparison, these chains remind me of the DID ERT2 unsealed MX chain for corrosion resistance but incorporate sealing for the same price. The good DID sealed chains like ERV3 are now about $170! Yikes!

These chains are awesome. They last a long time,are narrow for a o-ring chain, and spin freely when lubed. It's all I use now

pros: seems very durable, only had to re-tension 2x- great o- type option for bikes that require narrow chains-gold chain is a cool lookcons: chain is pricey as is the master link spare

The chain came with a clip style master link so no need to purchase this separately. The chain is narrow so it will fit most pre-sealed O ring equipped bikes. I'll have to take off a star for the stretch factor. Most sealed ring chains stretch very little and only need to be adjusted after the first ride. I'm still making significant adjustments to this chain after several hours in the saddle. I never had to do this with my DID VM. Price was good at $89.

Thin. Light. Strong. Quiet.

The thinnest sealed chain I have seen and good quality. I will definitely will be buying another in the future

this chain will fit a 2008 CRF450r, without rubbing the cases. So you don't need to shim the sprocket. It's also the lightest 0-ring chain you'll find, I race GP and MX, 1 adjustment after break-in and (keep it clean) it will last a year. I check side deflection with chain properly adjusted, (if you can push the chain into the tire easily, it's worn-out) time to replace.

It fits perfect and almost zero clearance to the PBi aluminum rear sprocket of crf250L and so far once tention adjustment...its off-road robust! Thanks amazon & RK