520 is narrower and requires 520 sprockets. Dont bother unless you need to possibly gain fractions of a second needed to win a race.

 

For a 520 conversion you MUST use a 520 front sprocket and rear sprocket with the 520 chain. SuperSprox sells the complete kit for the Street Triple for around $200 including the front sprocket. The 520 and 525 chains have the same side-plates but the 520 pins are not as wide by a slight amount (I got the gold colored side-plates). I would not recommend using a used rear sprocket with new chain; better to buy the complete kit all new as a set.
-I got a 2T larger rear sprocket, 49T, which gives even more roll-on power and actually has the same top speed on level road cos the engine will rev almost to redline. With the stock chain length 116 links the larger rear sprocket moved the axle ahead around 1/2 inch to the middle of the slot which noticeably quickened the handling on my 2010 STR.
-Keep in mind that sprockets must be properly torqued to the correct specification and the lock washer bent over on the front sprocket nut. Also chain installation requires a proper chain breaking/rivet-spreading tool done by an experienced mechanic.
-After initial stretch adjustment, I find I don't need to adjust the 520 chain any more often than the 525 with proper cleaning and lube. I have seen 520 conversion kits for 1000cc sport-bikes in motorcycle magazines.
-The main advantages of the 520 conversion is a bit less rotating mass and a little quieter operation, and sometimes different rear sprocket sizes are hard to find in 525.

 

I've had a DID 520 chain on for 2 seasons now, holding up great. The front sprocket is a common fit that will work on other bikes, the back sprocket has a particular bolt pattern that probably won't work on anything but triumph. If you are getting new chain and sprockets, might as well go 520. The supersprox rear is great, aluminum inner with steel teeth outside.

 

http://sprocketcenter.com/street-sp...-applications/triumph/675-street-triple-2008-2015/520-conversion-sprockets.html

 

You might save a half pound or so, but it's 100% rotating mass and >50% unsprung mass, so it's an important half pound. I would go to a 520 kit if I was needing a new chain. I don't put many miles on my ST3 (2-3K annually) so the 525 is overkill for my ST3. You can also get some sweet anodized colors on rear sprockets.

 

Thanks guys, all great responses and ideas.

I must say that I have 50,000 miles on my Street Triple. So I have changed my sprockets and chain a couple of times before. The crappy original chain lasted 10,000 miles only. since then I have, only, used D.I.D. chains and Supersprox sprockets. Really great quality products.

On my conversion to 520 I'm looking into D.I.D. 520 ERV3, and supersprox sprockets. It seems 520s won't last as much as the 525s but I always clean and lube my chains, and that's may be why the chains lasts.

thanks again,
safe rides!!

 

50K is an impressive number. I don't think I've put 20,000 miles on all my street bikes combined.

Big fan of DID myself. Supersprox are steel teeth mounted on aluminum carrier, right? That seems like the right way to go for a high-mileage bike.

 

conrazy, steel sprockets on aluminum carries is correct.

I want to say that my chains and sprockets lasted about 15,000 each time.

I wanted to make sure that 520 will be ok for my bike, which I commute on, beside the other fun staff.

 

Cool, thanks. Where do you buy your DID/Supersprox kits? I might have to look into a 520 kit myself.

 

I got 30,000 miles out of my original OEM chain and went with the "Superlite" 520 kit. It was around $140 if I recall correctly. To be honest, the ONLY reason I went to a 520 was for the simple fact that if something happens while you are out on the road, there's a pretty good chance that no matter what shop you walk into - they will only have 520 stuff on hand.

 

I changed my OEM setup at around 20k miles and it still had some life left. Was headed out on a big trip so I changed it for good measure. I got roughly 24k miles on the 520 conversion and only recently replaced it all due to tight spots in the chain.

I felt an immediate improvement in going to 520, most notably in throttle response. I think I measured close to 3lbs total savings over stock.

For the record, I run 520 on my 1050 too with zero issues so far.

 

With the 520 conversion the main thing is to make sure the 520 chain is rated for the application; eg 500,750 or 1000cc sport bike.

 

Hey buddy. I have done the front sprocket (-1T) and its great. have a look at my thread.
The back sprocket and chain is still stock. It pulls crazy now. Very nice to ride. Even more fun.
Have a look at my thread.
Here

 

conrazy,

I have bought the Supersprox for the back form Britishcustom. The front sprocket not Supersprox.. They only have stock size.

There are some websites that have Supersprox on different sizes.

anau006,
thanks for the tip. I think I'll go with stock size on the front and only +1 tooth on the back. I know people's going to say why bother... but with the weight saving of the 520 and +1 on the back, is going to be enough for a season to see in what direction I want to go. Bike is plenty fast, and with my race exhaust and tune, all it needs is a little perk on the take off.
-1t on the front gotta be nice, but commuting in busy traffic, could be a recipe for disaster on the streets.

safe Rides!!

 

Thanks! I have the -1T front and it's perfect for the track and riding around town, but I wouldn't want it for commuting.

 

MotoMummy has the best chain and sprocket deals out there, I got a driven steel sprocket set with an EK MVXZ chain for 178 shipped. If your bike is not listed, call them and they will email an invoice for your bike.

 

+1 Driven and Motomummy

Driven make a nice black steel rear that is lighter than stock, but not radically lightened so much as to compromise integrity (some lightened steel sprockets by other brands experienced failures). They are a little heavier than aluminum but will last longer.

 

Lucky for me i dont commute. I am a weekend warrior


Sent from my iPhone using Tapatalk

 

Commuting in Northern Virginia is like being at the track...


...The demolition derby track, that is.

 

you can order conversion kits from supersprox.com

 

I'd be nervous to run a 520 on a liter bike. I've broken and thrown chains before. Usually go sentences shopping afterwards. I've got almost 30K out of the OEM chain & sprockets now. Waiting for "that vibration" to tell me it's time to change the set now. Going to go +1 C/S and go stock size on an aluminum rear sprocket.

 

Modern 520s, if your not drag racing or stunting are more than fine.

 

keep it oiled and adjusted too, no worries

 

Wayne's Striple,
do you think I would have to do a speedo adjustment if I go +1T on the back sprocket?
did you have to adjust your speedo when going +2t on the back sprocket?

thank you,

safe rides!!

 

The common number being thrown around was that the speedos were +6% higher at stock gearing. I went to a +2 larger back sprocket which was another +4% error. So I have it adjusted -10% in TuneECU.

 

thanks dementedbrave.
I'll get that speedo adjusted with Tune ecu.

Safe Rides!!!

 

I believe that the Street Triple models after the 2012 year speedos are not affected by sprocket changes, but earlier ones must be corrected electronically with TuneEcu. Keep in mind that when changes are made to the map it must be re-uploaded to the ECU for the changes to take place. I also de-selected the SAIS when I installed block-off plates and changed the QuickShifter cut-out times to 50ms for low/mid rev shifting.

 

Sorry to hijack the thread, @Wayne's Striple, did you notice any different after installed block-off plates and de-selected SAIS?

Many thanks
Jim

 

I installed the block off plates awhile back and noticed a difference, less backfiring out of the exhaust. Probably not worth doing if you have a stock exhaust. Now I have my crankcase breather hose routed to the SAIS ports.

 

Does anyone make a 520 sprocket with a rubber damper on it? I need to replace the chain on my 2010 anyway and I figured I might as well do the conversion, though I'd prefer to keep gear noise down. There are 525 sprockets available with dampers, but I can't seem to find a 520.

 

Just installed my 520 "kit" the other day.

Lightened steel 15t front, 49t red SuperSprox Stealth rear, and DID gold/black 520VX2 118 link chain. Bike feels more responsive and snappier, yet still very manageable.

 

Just installed my 520 "kit" the other day.

Lightened steel 15t front, 49t red SuperSprox Stealth rear, and DID gold/black 520VX2 118 link chain. Bike feels more responsive and snappier, yet still very manageable.

View attachment 332930

Looks great! Love the red sprocket and gold chain. Thanks for posting. I plan to do something similar to my bike, but I want to first see how my current gearing does at the track this spring, as I'm changing rear tire size to a 190/55.

Might do a Driven aluminum rear sprocket, though, as I don't ride many miles each year.

 

It looks good with the gold calipers.

 

Thanks! I always thought the gold calipers looked off on a mostly black/red bike. But I'm coming around to it now.

 

Nope. I use DuPont Chain Saver which is a Teflon based aerosol so it goes on and dries pretty quickly. No fling and no debris. I like the look of the bike without the cover.