Sprocket Change

[blacklav]

I want to fit a reduced size rear sprocket on my street twin 900 by at least 2 teeth. Anybody done this?
Where did you get the sprocket from?
Any info much appreciated.
Chris r.

 

[Anderson11111]

I found a video for you" We are counting on which sprocket to put on your motorcycle
View: https://www.youtube.com/watch?v=3qR5e4nOGy

try it, maybe advice work and be useful for you. But I don't think a 900cc engine would respond well to such a change. I could be wrong of course

 

[243jimb]

I want to fit a reduced size rear sprocket on my street twin 900 by at least 2 teeth. Anybody done this?
Where did you get the sprocket from?
Any info much appreciated.
Chris r.

Firstly, I increased the front sprocket on my Bonneville from 17T to 18T then reduced the rear from 43T to 41T, finally I changed the front for a 19T and this is where I will leave it. It has reduced the acceleration slightly but not too much and now the engine is much more "relaxed" at higher speed. Some owners go the other way but I definitely wouldn't, they rev too high for my liking with the standard gearing. Changing the front is easier and cheaper than the rear.

 

[triumph900]

Firstly, I increased the front sprocket on my Bonneville from 17T to 18T then reduced the rear from 43T to 41T, finally I changed the front for a 19T and this is where I will leave it. It has reduced the acceleration slightly but not too much and now the engine is much more "relaxed" at higher speed. Some owners go the other way but I definitely wouldn't, they rev too high for my liking with the standard gearing. Changing the front is easier and cheaper than the rear.

Interesting. Which Bonneville do you have and did you find the sprockets?

 

[blacklav]

Firstly, I increased the front sprocket on my Bonneville from 17T to 18T then reduced the rear from 43T to 41T, finally I changed the front for a 19T and this is where I will leave it. It has reduced the acceleration slightly but not too much and now the engine is much more "relaxed" at higher speed. Some owners go the other way but I definitely wouldn't, they rev too high for my liking with the standard gearing. Changing the front is easier and cheaper than the rear.

Sounds good to me. Thanks for the info

 

[Rolandrat]

I run 19 front 40 rear runs more relaxed,I used to ride everywhere at 50 mph cos anything above engine just was annoying me.865 air cooled. Sprockets from ebay. It returns 61mpg another bonus. Don’t forget speedo will need calibration

 

[243jimb]

Interesting. Which Bonneville do you have and did you find the sprockets?

I have a 2002 which was originally 790cc but I swapped the barrels and pistons to make it 865cc. The rear sprocket is a Sunstar and the front is German made (I don't recall the name) from Square Deals.

 

[Rolandrat]

 

[triumph900]

I'm looking for sprockets for water cooled T100/Street Twins. I'd like to try 18 front and/or 39 rear.

 

[243jimb]

View attachment 53466

Esjot is the name of the sprocket that I bought from Square Deals.

 

[brooke]

Just go with the 17 tooth sprocket on the front . It will probably require no other changes . You can buy it any where . JT has a nice one with damping rubber on it ,very inexpensive, I believe they are oem on Triumph . It’s a 520 not a 525 .

 

[blacklav]

Just go with the 17 tooth sprocket on the front . It will probably require no other changes . You can buy it any where . JT has a nice one with damping rubber on it ,very inexpensive, I believe they are oem on Triumph . It’s a 520 not a 525 .

That's what I'm after but apparently they don't fit the 2022 on models. Look all over even triumph site don't do them.

 

[brooke]

Sorry , I misunderstood and got you on the wrong track . A 17 t on your bike will gear it lower , the std on yours being an 18 you want a 19 or a 37 or 39 rear ( jtr 2014 ) . that’s assuming your bike came with the 41 rear . My tigers and Thruxton r all came with 16 t fronts and I put 17 teeth on at the first oil change , works for me . If you do want a 17 for a WC 900 jtr 1186rb should be the ticket . It’s in the jt catalogue for the Thruxton R , 16 or 17 teeth . 525 and 520 use the same sprocket . The 2022 models aren’t in the catalogue yet so assuming their the same as the 21 models .

 

[blacklav]

Sorry , I misunderstood and got you on the wrong track . A 17 t on your bike will gear it lower , the std on yours being an 18 you want a 19 or a 37 or 39 rear ( jtr 2014 ) . that’s assuming your bike came with the 41 rear . My tigers and Thruxton r all came with 16 t fronts and I put 17 teeth on at the first oil change , works for me . If you do want a 17 for a WC 900 jtr 1186rb should be the ticket . It’s in the jt catalogue for the Thruxton R , 16 or 17 teeth . 525 and 520 use the same sprocket . The 2022 models aren’t in the catalogue yet so assuming their the same as the 21 models .

I got it wrong too. It's a 19 tooth I want. I'll have a look on the jt site. Thanks