15/43 or 16/45 on SV650? - Motorcycle-Journal Forums

SERGE · 10-17-2005, 10:45 AM

I find the gears on my SV650 slightly short for our roads. We don't have that many twisties. It is more like long sweeping curves at 50/60 mph and highway ridding.

I am thinking on changing either the front sproket (1 up) or the rear one (2 down).

The quesion is, has anyone done it? Is there a mathematical formula that tells you what it should be? I want to know how much more top speed I would get on each gear, focusing on 1st, 2nd and 3rd. I do not want to end ridding the clutch in slow moving traffic because the gears end being to long.

The final ratio would be 2.81 with the 16/45 or 2.87 with the 15/43. The standard version (mine) comes with 3.00 and the S version with 2.93.

Thoughts?

Nexus242 · 10-17-2005, 11:40 PM

This should help with the ratios.

==> http://www.sprocketspecialists2.com/...ptimizer2.aspx

I'm doing the 520 chain conversion but sticking with the stock sprokets 15/45 for my naked tomorrow. As far as I know top speed isn't greatly effected with changing from stock specs. Either you get more lowend (ie wheelie power) or more on the top end.

honduhx · 10-26-2005, 11:49 PM

Um im not to familiar with an sv but this is all my opinion. If you want more top end out of your bike and longer gears. Have you considered getting a bigger bike. Im one down on mine in the front and going to go up at least 2 in the rear. Not very often do i do 150+ mph but its always fun to get up to that speed asap.

**Clint** · 10-27-2005, 08:19 AM

Changing to taller gears doesn't give you a higher top end. Aerodynamics limit street bikes, and you're not at redline in top gear.

The only reason to change gearing is to shift the rpm range for acceleration and cruised characteristics.

10-17-2005, 10:45 AM	#1 (permalink)
SERGE Seat Tester Joined: Mar 2005 Posts: 69	15/43 or 16/45 on SV650? I find the gears on my SV650 slightly short for our roads. We don't have that many twisties. It is more like long sweeping curves at 50/60 mph and highway ridding. I am thinking on changing either the front sproket (1 up) or the rear one (2 down). The quesion is, has anyone done it? Is there a mathematical formula that tells you what it should be? I want to know how much more top speed I would get on each gear, focusing on 1st, 2nd and 3rd. I do not want to end ridding the clutch in slow moving traffic because the gears end being to long. The final ratio would be 2.81 with the 16/45 or 2.87 with the 15/43. The standard version (mine) comes with 3.00 and the S version with 2.93. Thoughts?

10-17-2005, 11:40 PM	#2 (permalink)
Nexus242 Can Ride And Chew Gum Joined: Aug 2004 Bike: yellow and black Location: Wide awake in dreamland... Posts: 1,935	This should help with the ratios. ==> http://www.sprocketspecialists2.com/...ptimizer2.aspx I'm doing the 520 chain conversion but sticking with the stock sprokets 15/45 for my naked tomorrow. As far as I know top speed isn't greatly effected with changing from stock specs. Either you get more lowend (ie wheelie power) or more on the top end. __________________ The killer in me is the killer in you My love I send this smile over to you...Smashing Pumpkins

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10-26-2005, 11:49 PM	#3 (permalink)
honduhx Seat Tester Joined: Jul 2004 Posts: 95	Um im not to familiar with an sv but this is all my opinion. If you want more top end out of your bike and longer gears. Have you considered getting a bigger bike. Im one down on mine in the front and going to go up at least 2 in the rear. Not very often do i do 150+ mph but its always fun to get up to that speed asap.

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