51T Rear Sprocket

[trapezeartist]

I had a really good feel for my old (2021) bike with a 51T sprocket on it. Foolishly I left it on when I changed the bike, thinking it would be easy enough to get another one for my new (2023) bike. It's not. I can't find one anywhere. Does anyone one have one to sell, or know where I could get one? 51T preferred but I would go with 50T or 52T too.

[konrad]

There's a line for Country on the inquiry form, so it would seem they sell outside the US too.

https://www.rebelgears.com/ordercustomsprockets.html

 

[Tr1AL]

13 hours ago, trapezeartist said:

I had a really good feel for my old (2021) bike with a 51T sprocket on it. Foolishly I left it on when I changed the bike, thinking it would be easy enough to get another one for my new (2023) bike. It's not. I can't find one anywhere. Does anyone one have one to sell, or know where I could get one? 51T preferred but I would go with 50T or 52T too.

Try Haase low friction sprockets sold on ebay by hanson-racing  , they are on facebook also

[ChrisCH]

Jitsie do an EM rear sprocket for the smaller chain size in a range of tooth variants.  Splat shop sell them but are out of stock on all but the 55T

https://www.splatshop.co.uk/jitsie-solid-rear-sprocket-4-bolt-428-pitch-electric-motion.html?srsltid=AfmBOoo28NUBvJw_1_RLu4wrbq0-NU8ANVXhpK9ORKej5Dh_TD-ohhUPoLM

Might be worth asking if they are planning on gettig the 51 any time soon?

[ChrisCH]

Hmmmph  The Jitsie site no longer shows the 51T variant.  Neither does S3  (don't think they ever did one)  I did look when we had the old bike with the smaller chain and remember a 51 in Jitsie for sure.  There is a 52T listed.

You might have to bite the bullet and get one made.

https://www.motorcycleraceparts.co.uk/motorcycle-chains-and-sprockets/bespoke-custom-made-one-off-special-rear-motorcycle-sprockets/

[trapezeartist]

2 hours ago, ChrisCH said:

Jitsie do an EM rear sprocket for the smaller chain size in a range of tooth variants.  Splat shop sell them but are out of stock on all but the 55T

https://www.splatshop.co.uk/jitsie-solid-rear-sprocket-4-bolt-428-pitch-electric-motion.html?srsltid=AfmBOoo28NUBvJw_1_RLu4wrbq0-NU8ANVXhpK9ORKej5Dh_TD-ohhUPoLM

Might be worth asking if they are planning on gettig the 51 any time soon?

I bought the first one from Splat Shop. They have been very helpful in trying to find me another, but no success.

[faussy]

I don't have an EM so not sure what the standard front sprocket is but if you run a 10/51, it's virtually identical to 11/55, and I see above 55 is available. 11/51 is also very similar to 12/55. Not ideal, you would probably have to buy another chain aswell as the front sprocket, but an option albeit an expensive one

Edited Wednesday at 10:56 AM by faussy

[trapezeartist]

On 8/6/2025 at 11:54 AM, faussy said:

I don't have an EM so not sure what the standard front sprocket is but if you run a 10/51, it's virtually identical to 11/55, and I see above 55 is available. 11/51 is also very similar to 12/55. Not ideal, you would probably have to buy another chain aswell as the front sprocket, but an option albeit an expensive one

I did calculate all the permutations, though I've lost them now. Going up one tooth on the front would also give suitable gearing but space is tight. I think it would fit but it would require the chain to be threaded on to the sprocket rather than just looped on sideways (and turning the sprocket by hand is extremely hard). I'm hoping a custom-made sprocket will be the way to go, which I think will cost about £30-£40 more than an off-the-shelf.