Chainring replacement for Cube Reaction Hybrid SL 2021

th3c0d3r

Member
Sep 13, 2021
24
8
Romania
I have recently bought a Cube Reaction Hybrid SL 2021 and I want to change it's Sram X-Sync 2 Eagle 38T chainring (see image) with a smaller one 36/34T because I'm fat and I live in the mountains and I don't want to strain the motor/transmission when going uphill.
The problem is that I do not know if this is a boost or a non-boost chainring so I don't know what to buy.
Can you help me identify it? Thx!

L.E.: What tool do I need to mount/dismount this?
20230113_175905.jpg
 

John_A

Member
Sep 26, 2022
190
61
UK
Don’t know the answer but with the stock gearing the lowest gear is really low. Would a smaller chainring really make much difference?
 

th3c0d3r

Member
Sep 13, 2021
24
8
Romania
The answer is that it comes with BOOST chainring, you can can identify it by looking on the backside, it has "BOOST" engraved to it.
From my experience I can say it does, I have bought a 34T chainring, 4 teeth make a huge difference, I also have a Scott Ransom eRide that has the same 29+ wheels, same engine, same transmission and the 34T chainring on it doesn't seem "really low" on steep climbs.
 

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