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Thread: Change sprocket 16T (front) and 43T(Rear) with 520 on shiver 2015. Any review?

  1. #16
    apriliaforum expert High Country's Avatar
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    Quote Originally Posted by IndelibleInk View Post
    I prefer the extra shove at slower speeds, personally.
    Me too. I rarely approach top speed, but I take mine off road quite a bit. The ability to approach zero mph without using the clutch is useful to me, and the extra acceleration from 0-100 is nice too. If all my riding partners were on sport bikes, however, I would want the best possible top speed. My wife currently rides a DR350 dual sport, so that hasn't been an issue.

    In fact, we are talking about chasing top speed with her bike (now at about 70-75 mph). We may do a 440cc big bore kit, then use a smaller sprocket to gain some highway speed. That's more than $1000 investment on a $1500 bike, though, so I haven't been pushing the idea too hard. She keeps seeing new bikes she likes, so we might go that route too. She wants an all terrain bike that weighs no more than 350 lbs, does 90-100 mph, and has the ability to mount panniers. Maybe a KTM 390 Adventure or Kawasaki Versys 300.

    2009 Aprilia Dosoduro 750 (Adventurized: http://www.apriliaforum.com/forums/a...893274&thumb=1)

  2. #17
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    Quote Originally Posted by High Country View Post
    Me too. I rarely approach top speed, but I take mine off road quite a bit. The ability to approach zero mph without using the clutch is useful to me, and the extra acceleration from 0-100 is nice too. If all my riding partners were on sport bikes, however, I would want the best possible top speed. My wife currently rides a DR350 dual sport, so that hasn't been an issue.

    In fact, we are talking about chasing top speed with her bike (now at about 70-75 mph). We may do a 440cc big bore kit, then use a smaller sprocket to gain some highway speed. That's more than $1000 investment on a $1500 bike, though, so I haven't been pushing the idea too hard. She keeps seeing new bikes she likes, so we might go that route too. She wants an all terrain bike that weighs no more than 350 lbs, does 90-100 mph, and has the ability to mount panniers. Maybe a KTM 390 Adventure or Kawasaki Versys 300.

    Just noticed this. I have a 2017 CRF250L, the "Rally" version of which is often compared to the Versys. It's an inch taller and the suspension is even softer than the standard L (thanks to a different linkage), but it'll happily do 70-75 once broken in, albeit a bit revvy. I have seen 90-odd when I accidentally over-inflated the tyres. I find it a touch heavy for technical off road, but it's perfectly capable as long as you don't go so fast as to ask too much of the suspension!

    I got the Honda as KTM didn't seem forthcoming with a 390 Enduro, and I wasn't aware of the SWM RS300R (basically a BMW era Husqvarna with the burly black top engine). Those would have been more ideal for me, I think.
    2009 Shiver (White) | UK

  3. #18
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    Nice explanation. I used 16/43 with 520 chain i feel the speed only 208 with air resistance. U said if 15/43...the top speed only can reach 206km/h but can feel the torque. Conclusion the standard size 16/44 is the best combo for torque n speed. Am i right?

  4. #19
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    Quote Originally Posted by zulheikal View Post
    Nice explanation. I used 16/43 with 520 chain i feel the speed only 208 with air resistance. U said if 15/43...the top speed only can reach 206km/h but can feel the torque. Conclusion the standard size 16/44 is the best combo for torque n speed. Am i right?
    Was it 208 km/hr on the GPS, or on the speedometer?
    2009 Shiver (White) | UK

  5. #20
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    On the speedometer.

  6. #21
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    Then your 208 km/hr is probably faster than than it seems, because the gearing affects the speedo reading - it's "counted" in the gearbox, not at the wheel. A GPS reading would be better, if still not necessarily 100% accurate.


    Your gearing is 16 / 43, mine is 15 / 43 - that's a relatively large difference of 6.66...%. So when both our bikes read 200 km/hr, and assuming the tyre is the same and the ECU's speedo calibration is the same, then your bike will actually be going that 6.7 % faster.

    Put another way, when your bike is showing 208 km / hr, mine would be showing 222! If your speedo was exactly accurate before you changed the gearing, then your actual speed would be closer to 213 km/hr for an indicated speed of 208.


    Without knowing how accurate your speedometer is / was, we can't really compare this way. You would be better off trying the other gearing options yourself, and remember to correct for the speedo error!

    Also, my bike is not stock: I have modified the airbox inlet, a DNA air filter, exhaust de-cat and cans - this means the fuel enrichening at the top end does not affect my bike as much, so it makes power for longer (past the peak power rpm: 9250) than stock.

    What mods and rear tyre do you have?
    2009 Shiver (White) | UK

  7. #22
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    That's was very good n simple explanation buddy. Make me a bit relief. Currently my bike was on DNA filter with ngk plug plus akrapovic muffler only. I used tyre bridgestone R10 120/70/17 and 190/55/17. I didnt touch anything on ecu or speedo.

    My weight was 90kg. Sometimes with sprocket 16/43, i felt that the torque become more less make me to push harder on the trottle. I am still looking to find what size of sprocket that fit with my riding. I felt want to change back to 16/44. Do you think its worth it if i just change the front 15t like you use? I want back my torque and standard speed.

    Thanks

  8. #23
    apriliaforum expert High Country's Avatar
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    The 190 tire is also giving you slightly taller gearing.
    2009 Aprilia Dosoduro 750 (Adventurized: http://www.apriliaforum.com/forums/a...893274&thumb=1)

  9. #24
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    Your rear tyre is larger than stock (by around 1.5 - 2%, going by the nominal dimensions), so your gearing is slightly taller anyway as a result. Since I still use a 180/55 tyre, that bumps your gearing up to a whopping 8.5% taller than mine, and so your 208 km/hr is now more like my 226!!


    I personally prefer the shorter gearing, because I don't ride very fast
    A 15t is cheap enough and easy enough to fit if you want to try it out; just be aware it will make your wheelbase longer with the standard chain once you re-set the slack, and that will affect the steering feel slightly.


    I plan to put a 190/55 rear tyre on mine, a Metzeler M7RR most likely, which itself is taller than, say, their Z8 in the same 190/55 size - tyres need to be measured if you want any kind of accuracy.

    That larger tyre may mean I go down further to 15 / 44 gearing, I shall have to see...
    2009 Shiver (White) | UK

  10. #25
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    Do you mind to share, how much your top speed with 15/43t sprocket?

  11. #26
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    It was 129 mph GPS, about 137 on the speedometer.
    2009 Shiver (White) | UK

  12. #27
    apriliaforum expert rule62's Avatar
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    As a note: 15/44 is the stock gearing on the new DD 900. It's also the gearing I chose for my DD 750 520 swap. And I run a 190/55 out back. I like it.
    Last edited by rule62; 01-09-2018 at 12:20 PM.
    2014 DD 750 ABS - Spark exhaust, Arrow decat, headers (all ceramic coated), BMC filter, BikeMaster DLFP16-BS LiFePO battery, NGK iridium plugs, GPR steering damper, DD 1200 fully adjustable rear shock w/spring swap, 2016 Tuono Factory wheels, 15/44 520 conversion (PBR/Superlite/DID), Strada-7 fork preload adjusters, Samco 2-piece hose kit w/clamps, Engine Ice, Renazco Racing seat, EvoTech tidy tail, Aprilia grab handles, shorty levers, crank-case breather mod, evap-can delete... and a Rapid Bike EVO.

  13. #28
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    Do you mind to share your feel with 15/44? Torque n speed. Thank you.

  14. #29
    apriliaforum expert rule62's Avatar
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    It's virtually identical to the stock 16/46 on the DD, which I like a lot. I've got a 190/55 on the rear, so that negates the ever so slightly shorter gearing. RPM/gear/speed are pretty much the same as they were. However, with the smaller components, and the swap to 520 pitch, the unsprung rotating weight savings are noticeable. The bike spins up more quickly because the driveline now has less parasitic loss.
    2014 DD 750 ABS - Spark exhaust, Arrow decat, headers (all ceramic coated), BMC filter, BikeMaster DLFP16-BS LiFePO battery, NGK iridium plugs, GPR steering damper, DD 1200 fully adjustable rear shock w/spring swap, 2016 Tuono Factory wheels, 15/44 520 conversion (PBR/Superlite/DID), Strada-7 fork preload adjusters, Samco 2-piece hose kit w/clamps, Engine Ice, Renazco Racing seat, EvoTech tidy tail, Aprilia grab handles, shorty levers, crank-case breather mod, evap-can delete... and a Rapid Bike EVO.

  15. #30
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    I changed mine to the 520 chain and 48T rear sprocket. I kept the front the same size.
    Best performance change I made on my DD! Much quicker in all gears.
    Click image for larger version. 

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