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Discussion Starter · #1 ·
Thinking of going from 525 to 520 on my 09 Speedy to reduce driven/rotating mass. Also thinking of changing gearing at the same time and looking for your recommendations. Either -1 on front or +2/+3 on the rear. I'm tempted to go with -1 on front to keep the chain as short/light as possible, plus the sprockets are that little bit smaller/lighter.

However, I've gone -1 on other bikes in the past (eg Ducati 999) and found that the chain seems to stretch more and/or wear faster. Anyone have experience with this on later Speed Triples? Would it be better to go with +2 or +3 on the rear? What about gearing wise?

Your thoughts on gearing, chain and sprocket wear would be appreciated, as would any recommendations regarding which chain and sprockets to buy and where. DID X ring seems to be the best out there, is that true? What about sprockets? Thanks in advance.
 

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I did a 520 conversion on my little speedy, and was pretty happy with the results. I actually went up in the front as well as the back to reduce the common swingarm wear that effected the early prefire bikes. But the effective gearing change was two up in the rear. 14/42 to 15/47 if i remember correctly. I went through http://www.sprocketspecialists.com/ and everything went smoothly. I also used the gold DID X-Ring.

Any time you reduce teeth in the front you are going to see increased wear, you are basically tightening the route the chain takes. But when i say "increased" that dosent mean its not an acceptable rate, especially with the large fronts our bikes have to start with. Personally i dont think i would run a 520 on a little torque monster like an S3. I dont think the chain will last very long. For normal "spirited" street riding the bike has enough hp/torque that once geared where you want it, i dont think the 520 would offer much but increased maintenance time.. Just my opinion though
 

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I'd leave it at 525 and go +2 rear. Just replace both sprockets with something like Driven or Afam to reduce the weight. And a DID or RK chain.
 

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I'd leave it at 525 and go +2 rear. Just replace both sprockets with something like Driven or Afam to reduce the weight. And a DID or RK chain.
Stock chain is DID530VM, which is a very good and long lasting chain. It would be quite a waste to throw it away. I would only change +2 on the rear (this fits with stock chain) and even there go with steel for the longer life.

If weight is an issue then get a steel sprocket with the machined lightening holes. I have tried a few hard anodised alloy sprockets, but they require constant chain tightening and wear a bit too fast for my liking.

Smaller front increases swingarm rubbing strip wear so I also prefer the option of increasing rear sprocket size over dropping teeth on the front.
 

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Discussion Starter · #5 ·
Thanks. Any idea where I can get a +2 steel rear with the machined lightening holes, as suggested by Martin R?
 
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