Allant+ 8s chainrings

retiredNH

Member
Region
USA
The stock chainring on this bike is 46t, on a ProWheel crank. Where I live, a smaller (fewer teeth) chainring would be helpful. Does anyone know if such a thing exists?

Thanks
 

Alaskan

Well-Known Member
I have an Allant 9.9 that lists the chain ring as a prowheel on the Trek specs for the bike. The Prowheel is not even a Bosch compatible crank set. In fact the front chainring is the Diamante which is specifically designed to be compatible with Bosch gen 4 motors. Look at your bike and look at the Diamante and Prowheel and then tell us which one you have on your bike.

Diamante Bosch specific chainring
Product details
Compatible with Bosch Gen 4
With spider and bash guard
BCD: 104mm
eBikeBosch4Chainring_31470_B_Primary.jpg
 

retiredNH

Member
Region
USA
It looks like the image Alaskan posted. Trek doesn't sell any alternative sizes, but why wouldn't alternative 10 speed rings that have a 104mm BCD work?
 

Alaskan

Well-Known Member
the front ring has nothing to do with how many speeds a drive train has unless it is more than a 1x It is the cog count in the rear that determines the # of speeds on a 1x drive train. On a 2x with two front chainrings the gear count is the number in back times the number in front. THEY DO offer the Diamante in different # of teeth, currently in stock are 40 and 46 teeth. The bcd does not really matter either as long as the front cog fits the front spider. It is the front spider mount direct drive spline that has to match up to the motor drive side as well as the offset so that the chainline is correct.

 

Akrotiri

Well-Known Member
Region
Europe
The trek Diamant rings won't fit.

I take it no one has any direct knowledge?
Yes it does, it’s literally the same exact component. I purchased an extra one and it’s the same exact product number.

For the 8s the 104mm/46t is stock.

If you want one that has less teeth trek’s livechat feature is very helpful and they could tell you definitively if any other chain rings with less teeth are compatible with the 8s.
 
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