Grand Prix 250
Main Motorcycle: '12 Bonneville T100
Join Date: Apr 2013
Location: Montgomery, Texas
Just to add my 2 cents . . . Yes, it's 36mm on the sprocket & yes, you'll need at least an 18" breaker bar & yes, keeping chain attached while mashing on the rear brake is an excellent tip.
I got 25k miles out of my chain and could have gotten more, but was coming on a long road trip, better safe than sorry.
Went with the 19t front sprocket. Haven't noticed any appreciable loss of zip, but the speedometer now reads true. Didn't replace the rear sprocket b/c unlike the front sprocket, there was no appreciable wear on it. Looked brand new. Makes sense to me. The rear sprocket makes approximately 1 revolution to 4 for the front one. Ergo, the front sprocket should wear out 4 times as fast!
Big proponent of regular chain maintenance. I use the DuPont teflon lube about every 350-400 miles. Doesn't sling dingle berries all over the bike & the chain & sprockets do great.
When you get where you're going, there you are!