28mm belt drive longevity

Jan 5, 2018
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I'm currently running an 18 cmx with the 21mm belt drive. I break a belt each year and this year I broke 2. It's not the end of the world but just inconvenent. Also belt prices have increased quite a bit over the last couple years.

So I'm curious if any yeti or cmx guys running the 28mm belts have had any issues? Any reason you have had to change belts? The price of the upgrade is substantial, actually it's probably not worth it strictly based on price, but if I never have to touch the belt again it's worth thinking about.

Thanks.
 

BirdmanID

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Apr 10, 2019
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Idaho falls
I had a cmx for a couple seasons and never broke a 28mm. But i don’t have a good handle on how many hours i rode it either.
 

cbc76am

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Dec 5, 2016
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Sounds like you are over tensioning the belt. You want 3/8" of deflection under reasonable finger pressure on the belt.
 

byeatts

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Nov 29, 2007
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dumping the clutch is very hard on chains and belt, Rekluse is much easier to the whole drive system , I have 196 hours on belt and still looks new on a 137SS with rekluse
 

AK1000

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I have an easy 90+ hours on my 1st belt before it went on myYeti 129, couple CMX in our group went thru a belt this year also but have to be 50-60+ hours before they did.
I dump the clutch all the time and they said the belt shock is what breaks them, also the shock from hitting things at speed.
 

jrlastofthebreed

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45 hours on my 28mm with some track/jumps and landing on hard pack with the throttle pinned. the chain did some serious stretching but the belt didn't stretch or break. For the cost of belts and the connivance of it I would upgrade and get the 28mm on your bike.
 
I picked up a 18CMX few years ago. It already had the track upgraded to the current track. In the fluff 21mm held up fine. When spring arrived it was a completely different story. I broke a couple belts Immediately after unloading. Upgraded to the 28mm set up and have not broke a belt yet. Upgrade hurts a little. Sitting in the truck or going back home while buddies are riding hurts a lot more
 

byeatts

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belt weight 4 oz. easy to swap out and or carry, much faster track speed and higher RPM.No stretch ever and no rust or lube, no mess. Its free HP and track speed.even the 21 mm were solid with rekluse, The 28 super strong, Never wore juan out or broke, On 3 rd year original Yeti belt and over 190 hrs with no intentions replacing still looks new. We Hammer these bike very hard "
 
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