15/43 = heaven!
06-05-2006 | 07:53 AM
#1
Thread Starter
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MotoGP
Joined: Apr 2005
Posts: 5,631
From: Montreal
15/43 = heaven!
Following the lead of IceBud, I recently changed the gearing on my VTR to 15/43 (had tried 16/43 and 15/41 previously) and LOVE the result. While I was concerned about it being geared too low for freeway and long-distance riding, it seems ok (15 mph per 1000 rpm in top gear). This equates to 5000 rpm at 75 mph (plenty fast if I want to keep my licence). The best part is that it just explodes forward when I turn the throttle (of course, my other mods, including the light flywheel and RC45 throttle, help matters too). I am very happy and am now looking forward to getting the 520 set-up I picked up from CNIDawg for the additional 2-3 hp it supposedly unleashes (not to mention the quicker response due to reduced inertia). I just have to figure out a way to wipe this silly grin off my face.....
Mikstr
Mikstr
06-05-2006 | 12:48 PM
#4
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Squid
Joined: May 2006
Posts: 82
Originally Posted by mikstr
Following the lead of IceBud, I recently changed the gearing on my VTR to 15/43 (had tried 16/43 and 15/41 previously) and LOVE the result. While I was concerned about it being geared too low for freeway and long-distance riding, it seems ok (15 mph per 1000 rpm in top gear). This equates to 5000 rpm at 75 mph (plenty fast if I want to keep my licence). The best part is that it just explodes forward when I turn the throttle (of course, my other mods, including the light flywheel and RC45 throttle, help matters too). I am very happy and am now looking forward to getting the 520 set-up I picked up from CNIDawg for the additional 2-3 hp it supposedly unleashes (not to mention the quicker response due to reduced inertia). I just have to figure out a way to wipe this silly grin off my face.....
Mikstr
Mikstr
06-05-2006 | 02:08 PM
#5
Hmm?
SuperBike
Joined: Oct 2004
Posts: 2,069
From: San Gabriel Valley
Originally Posted by mikstr
every time I have tried to change it it rejects it as being too long (even when I actually shorten it), not sure what is up with that. Mind you, I haven't tired with the new host though
06-05-2006 | 03:19 PM
#7
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From: Montreal
Most of my riding is sport-touring in nature. While it does rev a bit high for high speed superslabbing compared to the stock set-up, my other mods (see previous threads about intake mods and bar end weights) help keep the engine smooth. Noise is not much of an issue as I wear ear plugs but wind noise far exceeds the engine noise anyhow. One positive thing is that having it rev more quickly keeps me riding at a more reasonable pace. Besides, the rush I get every time I roll on the throttle makes it all worthwhile (makes overtaking a real blast!!!!). Finally, on anything other than freeway riding it is the cat's meow. Next time I buy a new sprocket combo I may actually go to 15/42 to split the difference between the 41 and 43 but for now, I'll just keep grinning 
cheers
Mikstr
cheers
Mikstr
06-05-2006 | 07:47 PM
#8
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Superstock
Joined: Mar 2005
Posts: 295
From: Seattle
I have been running a 520 with the 15/43 for 2 seasons now and like it. I actually need to change my rear sprocket this year and I will be giving a 44 tooth sprocket a whirl.
I love the wicked snap that the gearing gives our bikes so much that I have to try for more
I love the wicked snap that the gearing gives our bikes so much that I have to try for more
06-05-2006 | 08:01 PM
#10
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From: Gainesville FLA.
I love my 15/43 for the tighter stuff but the roads down here are straight and boring so I use a 15/41 for the street. It still has more punch but keeps the RPM's down, if you don't do a lot of open road riding then I highly reccomend the 15/43.
06-05-2006 | 08:25 PM
#11
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From: Leander TX!!
Originally Posted by superhawk22
I love my 15/43 for the tighter stuff but the roads down here are straight and boring so I use a 15/41 for the street. It still has more punch but keeps the RPM's down, if you don't do a lot of open road riding then I highly reccomend the 15/43.
06-05-2006 | 08:40 PM
#13
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From: No longer in 'The Suck'!!!
I love the 15/43 setup. Mostly commuter type riding, with the occasional longer haul. I did ~350 miles two weekends ago and it wasn't bad at all. I do find 5th gear almost useless now though. I don't think I'd do the 500 miles to Dayton OH from DC I did last fall, might go back to stock for that. But with the 15/43 you don't have to change the chain out from stock, so it's all good. Plus if you know someone with a rearstand wherever you're travelling long distance to, you can swap out for the twisty stuff when you get there!
06-09-2006 | 01:19 PM
#14
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From: Leander TX!!
Originally Posted by superhawk22
I think you'll probably like the 16/43 just fine.
06-09-2006 | 02:33 PM
#15
Señor Miembro, Ay Caramba
SuperSport
Joined: May 2006
Posts: 562
From: a little north of DC
Look at all those posts. I'm surprised you haven't managed to come across this before. IIRC, it was about 7%.. and I check my calculator... 1 - 41/43 = .0465 or 4.65%. I think that's the math. Could be 1 - 43/41 (4.87%) but I think that is going from a 43 to a 41. Someone will confirm or deny.
06-09-2006 | 02:42 PM
#16
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SuperSport
Joined: Sep 2005
Posts: 882
From: Dallas, TX
Originally Posted by cliffhangerstx
So how far off will the speedo be now with the 16/43 setup? and what will it do to the odemeter? as far as actual miles on the bike? Is there a way to figure it out?
Go to the Speedohealer website & use their gear calculator for changes to stock gearing
http://speedohealer.com/eng/adjust.htm
It's the "On-Line Calculator" button top center of page
I used a Speedohealer on mine with the 15/43 setup to correct the speedo reading.
I used a -15.6% correction factor with a new tire (yes it takes tire wear into account too!)
I'm kept the speedohealer to put on the CBR600RR
06-09-2006 | 05:44 PM
#17
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From: Leander TX!!
Originally Posted by CNI Dawg
Stock gearing & speedo is about 5% off - reads faster than actual speed.
Go to the Speedohealer website & use their gear calculator for changes to stock gearing
http://speedohealer.com/eng/adjust.htm
It's the "On-Line Calculator" button top center of page
I used a Speedohealer on mine with the 15/43 setup to correct the speedo reading.
I used a -15.6% correction factor with a new tire (yes it takes tire wear into account too!)
I'm kept the speedohealer to put on the CBR600RR
Go to the Speedohealer website & use their gear calculator for changes to stock gearing
http://speedohealer.com/eng/adjust.htm
It's the "On-Line Calculator" button top center of page
I used a Speedohealer on mine with the 15/43 setup to correct the speedo reading.
I used a -15.6% correction factor with a new tire (yes it takes tire wear into account too!)
I'm kept the speedohealer to put on the CBR600RR
06-09-2006 | 08:14 PM
#19
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Superstock
Joined: Apr 2005
Posts: 281
From: Denver, CO
What ScooberHawk says. SpeedoHealer says (including standard factory speedo-over-reading of 7.1% which mine was) your speedo could be off by 18%! Your speedo might say 75 but you're really only going 61.5 mph. I'd GPS it if I were you at a sustained 60mph (more if you can bear it for more than 3 minutes) and note the difference. After I adjusted everything for my 15T I was 14.1% off.
06-09-2006 | 08:46 PM
#20
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From: Montreal
Have a look at the link I posted in the Knowledge Base section (that is, after all, why I posted it there as this very topic comes up about as often as tire or oil questions *sigh*). It allows you to calculate speed vs rpm for any possible gearing combo. AS far as the odometer goes, it is dead-on with stock gearing (for Canadian VTRs anyhow, tried on a test strip of highway in Manitoba a few years back)
Mikstr
Mikstr
06-09-2006 | 09:07 PM
#21
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From: Leander TX!!
Originally Posted by mikecronis
What ScooberHawk says. SpeedoHealer says (including standard factory speedo-over-reading of 7.1% which mine was) your speedo could be off by 18%! Your speedo might say 75 but you're really only going 61.5 mph. I'd GPS it if I were you at a sustained 60mph (more if you can bear it for more than 3 minutes) and note the difference. After I adjusted everything for my 15T I was 14.1% off.
J/K
