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RK GB520MXU Chain?

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I was wondering how many of you run this chain and how long it lasts before it needs to be replaced. Is it pretty strong or would i get longer life out of a RK GB520EXW? Bike is a 2005 CRF250R

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Can't compare it to the GB520EXU, but I've had the MXU on my bike for over a year. No issues yet. I've only had to adjust it once and that was after first ride (initial stretch).

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My RK520MXU has 25.1 Hours on it now and is showing some wear. It is starting to get some side to side movement in it but its not all that bad.

I say it will probably last at the least another 10 hours of riding. The 25.1 hours that is on it now is from a whole season of mx racing this year which was 16 rounds of 2 classes + practicing when there wasn't a race.Also I have only had to adjust mine one time and that was after I put it on and about a couple rides at the track.

It has been a good chain I must say. Also the GB520EXW you are talking about,I believe it is 8500lbs of tensile strength and the MXU is 9000lbs.

I would get the MXU just cause of that. I couldn't find any info other than the tensile strength between the MXU and EXW. I guess they are the same other than the tensile strength.

BTW all RK chains are Gold Plated MXZ,MXU,EXW except for the standard ones

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The MXU has a 9000 lb. tensile strength with a wear life index rated at 600. Max cc for offroad:500.:smashpc:

The EXW has a 8500 lb. tensile strength with a wear life index rated at 1000.

Max cc for offroad:750. 👍

So would it be better to get rid of the 500 lbs. of tensile strength for the better wear life index? And will it need a countershaft spacer?

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I dont know if you should even bother getting a chain for anything bigger than what you are riding. Just get the chain that is recommended for the size and cc you have.

IMO I would just get a O-ring chain for your 250 and not bother with chains that are rated for a 500cc or a 750cc. They are rated that way so that horse power will not break the chain. I wouldnt get a 428 that is for a 125 and use it on a 450 or vice versa. I just go with what is recommended for my bike.

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Well, I'm getting it in a kit with a supersprox stealth rear sprocket(which i hear last an extremely long time), so i want to get a chain that will last the entire life of the sprocket.

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