NotVeryCreative16 Posted October 31, 2020 Share Posted October 31, 2020 (edited) I bought my 2015 FJ-09 used with the original chain and sprockets. I'm at 20k miles and the chain is definitely shot so I ordered a new one with some JT sprockets but I feel like my sprockete, especially the rear one, show very little wear. The front one definitely looks like it has some shortening/flattening of the top of the teeth but the rear one hardly shows any wear at all. I bought the heavy duty RK chain so I'd like to get 20k miles out of it but would hate for the sprockets to wear before then. At the same time, it would be nice to save $40 and keep the new rear sprocket for the next chain and just change the front one. What do you guys think? First two pictures are front sprockets, the rest are rear. Edited October 31, 2020 by NotVeryCreative16 Link to comment Share on other sites More sharing options...
NotVeryCreative16 Posted October 31, 2020 Author Share Posted October 31, 2020 🤢 Link to comment Share on other sites More sharing options...
NotVeryCreative16 Posted October 31, 2020 Author Share Posted October 31, 2020 Link to comment Share on other sites More sharing options...
NotVeryCreative16 Posted October 31, 2020 Author Share Posted October 31, 2020 Link to comment Share on other sites More sharing options...
nhchris Posted October 31, 2020 Share Posted October 31, 2020 I’d replace both at 20k.  You got your moneys worth out of those sprockets. 4 1968 Triumph Bonneville 650 1971 Norton Commando Roadster 2002 Harley 1200 Sportster 2003 Honda ST 1300 2016 FJ 09 Link to comment Share on other sites More sharing options...
GTO MIKE Posted October 31, 2020 Share Posted October 31, 2020 Yep replace both . Worn sprockets will wear a new chain out quicker ! MIKE 3 Link to comment Share on other sites More sharing options...
Ride365 Posted November 1, 2020 Share Posted November 1, 2020 Yup......replace the sprockets with the chain. 3 Link to comment Share on other sites More sharing options...
Premium Member DavidS Posted November 3, 2020 Premium Member Share Posted November 3, 2020 I agree with the others, replace them. I always replace the chain and both sprockets at the same time. You can get unusual wear on either of the sprockets, and putting a new chain on the old sprockets can cause noises and vibrations. As long as you have to do the work to replace the chain, the sprockets are easy to remove and replace at the same time. Â 2 Link to comment Share on other sites More sharing options...
Supporting Member knyte Posted November 3, 2020 Supporting Member Share Posted November 3, 2020 They're a wear component like brakes & rotors...replace 'em! 1 2015Â FJ-09 / FJR touring bags / oil plug mod / Evotech rad guard / SW Motech bash plate / VStream touring windshield / Seat Concepts: Â Sport Touring / Vcyclenut ABS rings (speedo correction) / Cosmo RAM mount Link to comment Share on other sites More sharing options...
chitown Posted November 3, 2020 Share Posted November 3, 2020 (edited) They've enough wear I would replace them. However, the rule of "always replace chain and sprockets as a set" for me applies to aluminum and some alloys. With modern steel components of oem quality or similar I'll inspect then decide. Edited November 3, 2020 by chitown 2 Link to comment Share on other sites More sharing options...
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