Sprockets And Gearing

https://sprocketcalculator.com/

 

One tooth less on the front will make a difference in low down acceleration and the standard chain length will be fine.

 

This site will answer all your questions
Edit* on sprockets and gearing, before any smart ass comments

 

You might want to add 3 or 4 teeth to the rear. It will move your rear wheel forward and shorten the wheel base slightly which will give you better handling. At the same time it will probably put you in the center forward of you chain adjuster and give you the extra low end grunt your looking for.

 

TonyG
Your question was answered by SamsGrandad. Lose a tooth. Even lose one front gain one rear will alter it slightly. But remember it will also alter the speedo reading.
Regards
Joe.

 

going to a lighter quality X ring 520 chain is a good move if your changing everything. on my 18 T120 i went from stock 17-37 to a 17-41 without issue, stock 100 link works. one tooth on the counter is OK but several teeth on the rear is better. i am enjoying less shifting for small inclines as well + better passing power with less if any downshifting

 

Need some info on changing the front sprocket on the '18 Bonneville.
Got the cover and brake stuff off OK, but the nut holding the sprocket was more than my tool box has in it, so far. It appears to be 75MM {almost 3"}. Sockets, tools in that realm are 1" drive. If you have changed that sprocket what tools did you have/use? Any insight would be great. Thanx

 

big but not 75MM!! did mine but forget the size BUT more general searching should get results. save the lockwasher + a bigger impact gun makes it easier. although the front is prolly easier + a bit cheaper a bigger rear stresses the chain less + if you have about 20 on it may as well do a kit- chain + both sprockets. i used a lighter 520 chain "kit" from sprocket center + an EK chain + their screw master link, no chain press- breaker needed!! i used 17-41 combo on my 18 T120 with stocl length 100 link chain that centered the axle allowing more adjustment later.