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Twins Talk Discussion of Hinckley Triumph Twin related matters and topics.

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Old 12-10-2012, 07:38 PM   #21 (permalink)
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just installed a scootworks BELT DRIVE, said to gear it up a bit, prolly a good thing, just enjoying a clean oiless rear wheel + tire, very nice kit!!!! 18 teeth front 43 rear, also read where belt drives use a little less power a 2.375 to 1

Last edited by rodhotter; 12-10-2012 at 08:08 PM.
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Old 12-11-2012, 06:00 AM   #22 (permalink)
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SprocketCenter.com

Here is another sprocket & chain supplier in the U.S. at least:

http://sprocketcenter.com/index.php/...s/triumph.html
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Old 12-11-2012, 09:33 AM   #23 (permalink)
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Quote:
Originally Posted by biker222 View Post
Here is a great gearing calculator.

Located Here: http://gearingcommander.com/
Thanks for posting this. Many will find it useful. It came in really handy when I went from a 39t to 41t rear sprocket on my Ducati GT1000. The change made the 6th gear usable. There was no detectable change in performance. Since I was now using the 6th gear, there was no change in gas mileage either, which was excellent at an average of 55+.
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Last edited by tsmgguy; 12-11-2012 at 09:37 AM.
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Old 12-12-2012, 06:00 AM   #24 (permalink)
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Quote:
Originally Posted by rodhotter View Post
just installed a scootworks BELT DRIVE, ... also read where belt drives use a little less power a 2.375 to 1
A drive chain is 98 - 99% efficient at transferring power. A belt drive is a little less.

Regards, Chuck
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Old 12-12-2012, 11:11 AM   #25 (permalink)
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after reading a lot of info the general conclusion is a belt uses less power, but whatever since i installed it for lo maintain, cleanliness and long wear. on my sportster with wire wheels they only get dusty, adj are rare after break in even with the old tech belt, scootworks carbon fiber-kevlar belt thats a few mm wider than a chain, very few, only needs o adjust after break-in 2-4 thousand miles, harley belts usually go 50-100 thousand miles, for me the clean wheel and tire sells it if i only get 50,000 i would buy it again, yes $579 for a belt + sprockets is expensive but comparing several chain + sprocket changes, especially with labor if you do not do it is not a bad option in the long run, on my 70 bonnie i was forever at the high pressure car wash mostly for the rear wheel, but chain lube has improved for sure, the PITA is not for ME i love a clean shiny ride!!!

Last edited by rodhotter; 12-12-2012 at 11:13 AM.
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Old 10-05-2013, 08:15 PM   #26 (permalink)
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Impossible math

Before changing to the 19t, I took note of precise rpm at speed. Now I am truly perplexed. 70mph was 4200rpm and now 70mph is 4200rpm! Math wise I should have seen about a 5% difference, a drop of about 200rpm. I am totally weirded out on this one. I noticed a 19t stamp on the new sprocket, but by God I'm pullin' that cover off and counting them. If I was sent an 18 with a 19 stamp, NewBonneville is going to hear about it!


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Old 10-06-2013, 06:21 PM   #27 (permalink)
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Ossaman.. the speedo is not accurate. The speedo drive is in the trans.. not at the wheel. As such if you tooth up or down you wont indicate any differently. It'll only be apparent when keeping up with traffic !
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Old 10-06-2013, 06:37 PM   #28 (permalink)
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I changed to the 19t on my 09 America and am very pleased with the top end speed on the freeway. It did change my speedo and at 70 mph on the speedo I'm actually doing 65 mph.
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Old 10-06-2013, 08:15 PM   #29 (permalink)
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Quote:
Originally Posted by OSSAMAN View Post
Before changing to the 19t, I took note of precise rpm at speed. Now I am truly perplexed. 70mph was 4200rpm and now 70mph is 4200rpm! Math wise I should have seen about a 5% difference, a drop of about 200rpm. I am totally weirded out on this one. I noticed a 19t stamp on the new sprocket, but by God I'm pullin' that cover off and counting them. If I was sent an 18 with a 19 stamp, NewBonneville is going to hear about it!


"Two wheels and a Blue Ridge Pkwy create positive ions":
With the electronic speedo Bonnevilles, (mid-year 2010 and up), you will need to use tune ecu and correct your speedometer reading after a sprocket or rear tire size change. With the 140-80-17 rear tire and a 17 tooth sprocket on my T-100, the speedometer and odometer read about 5% fast compared to my GPS. After the correction, it is within 1/2 of 1% of the GPS. (recent trip to the Dragon Raid was 1001 Triumph miles and 996 Garmin miles... close enough. BTW on my bike 50mph=3000rpm, 80mph=5000rpm.
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Old 10-07-2013, 02:03 PM   #30 (permalink)
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Quote:
Originally Posted by VintageSkies View Post
Ossaman.. the speedo is not accurate. The speedo drive is in the trans.. not at the wheel. As such if you tooth up or down you wont indicate any differently. It'll only be apparent when keeping up with traffic !
Errr, I don't believe you're correct.

If you take a look at the sport-bike community for instance, where going up in the rear is extremely popular, there's whole companies dedicated to patching VSS signals to correct the speedo (ie. speedo-healer). The VSS is in-trans for most sport-bikes too.

Front wheel sensors are only affected by tire diameter changes, not gearing. This is because the front wheel is fully independent, though changing the wheel diameter changes the circumference so 1 revolution is more or less distance. The calibration of the wheel sensor is set up for a particular diameter.

Transmission VSS's are affected by both tire diameter changes AND gearing.

So if what you said is accurate (VSS in trans), then gearing will affect the speed.
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