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#2593828 - 04/08/12 06:08 PM Sprockets JT vs Sunstar
Robenstein Online   content


Registered: 12/23/09
Posts: 3312
Loc: Central IA
Hey, just looking at doing a sprocket swap on a 99 Magna 750 for a friend. She bought it and the guy geared it for more acceleration, but it is getting horrible mileage now since she rides in out of town a lot. Got a new x ring chain for it, but I see that JT and Sunstar both make a decent selection of sprockets for it. Anyone ever have a bad experience with either? Looks like JT makes a few more options, but I thought Id see who here had some experiences with them on bigger bikes.
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2011 Triumph Speedmaster
1986 Chevy Monte Carlo SS
1970 Chevy Nova
2006 Scion TC

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#2593838 - 04/08/12 06:26 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Quattro Pete Offline


Registered: 10/30/02
Posts: 26127
Loc: Michigan
I am not liking the 17-tooth JT front sprocket that I got for my Vulcan. It dropped the RPMs as it should have (factory sprocket is 16T), but it causes more drive train noise and results in more vibration that can be felt through the footpegs. The JT one does not have rubber dampers built into it like the factory sprocket does. I am going back to the stock sprocket next week.
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#2593887 - 04/08/12 07:35 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Robenstein Online   content


Registered: 12/23/09
Posts: 3312
Loc: Central IA
I have used both on smaller 250 cc bikes. The current ones on this bike are sunstar. I was also thinking of going up a tooth on my front sprocket on my Triumph.
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#2593894 - 04/08/12 07:44 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Trav Offline


Registered: 11/20/06
Posts: 10238
Loc: MA, Mittelfranken.de
I have used them both in big bikes and had no trouble with either. Both went over 20,000 Km with and x ring chain which is good considering these bikes produce 165-185HP right out of the box.
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#2594245 - 04/09/12 08:19 AM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Smoky14 Offline


Registered: 04/23/03
Posts: 993
Loc: Nowhere NM
The biggest problem with cheap sprokets is not being tapered to allow smooth engagement of the chain. Some have a 90 angle between the side and the tooth tip and results in noise, and if not aligned can actually pull the counter shaft out of the case. You'd think it would break the chain first, but not in my experience.
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#2595549 - 04/10/12 12:26 PM Re: Sprockets JT vs Sunstar [Re: Quattro Pete]
rrounds Offline


Registered: 07/05/07
Posts: 459
Loc: SACRAMENTO, CA
On one of my bikes I went up 2 teeth to 16 on the front sprocket(that is the same as taking 7 teeth off the back sprocket 14/48) and my rpm's went down as did any vibration I had in the foot pegs and handle bars. My gas mileage went up but I could not accelerate as fast in 5th gear(that is why they put 4,5 or 6 gears in bikes) All I had to do was down shift and off I would go.

ROD
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#2595957 - 04/10/12 08:32 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Mackelroy Offline


Registered: 12/03/04
Posts: 788
Loc: Florida /Texas
Sunstar is an OEM manufacturer, JT is not, while JT may be okay I've seen instances where they are not machined properly.

If you want precision guaranteed, SUNSTAR

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#2596671 - 04/11/12 02:53 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
sunruh Offline


Registered: 06/28/05
Posts: 1634
Loc: Cedar Park, TX
i've run sunstar. pretty decent. now i only run Ironman (also sold as MSR heavy duty) but they are not for all bikes make/models.

and of course part of keeping a sprocket alive is making sure the chain is perfect. which is its own can of worms.
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#2597093 - 04/11/12 09:16 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Robenstein Online   content


Registered: 12/23/09
Posts: 3312
Loc: Central IA
Normally Id swap the chain as well, but it has SUPER low miles on it. I think I will try the Sunstar and if its not enough for her I can drop a few teeth on the back with a JT.
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1986 Chevy Monte Carlo SS
1970 Chevy Nova
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#2597846 - 04/12/12 04:33 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
rrounds Offline


Registered: 07/05/07
Posts: 459
Loc: SACRAMENTO, CA
Here is a good site to play with your gearing and not cost you a dime.
http://www.gearingcommander.com/

ROD
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#2597922 - 04/12/12 06:13 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Robenstein Online   content


Registered: 12/23/09
Posts: 3312
Loc: Central IA
Yeah the JT and Sunstar sites have gearing info on theirs as well. It does help though when making a choice.
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2011 Triumph Speedmaster
1986 Chevy Monte Carlo SS
1970 Chevy Nova
2006 Scion TC

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#2598178 - 04/12/12 11:02 PM Re: Sprockets JT vs Sunstar [Re: Robenstein]
rraiderr Offline


Registered: 11/26/06
Posts: 401
Loc: Dante's Inferno
AFAM and Renthal make some stout sprockets.

We have had 0 issues with them at the track.

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#2599256 - 04/14/12 08:55 AM Re: Sprockets JT vs Sunstar [Re: Quattro Pete]
vortex9 Offline


Registered: 09/23/08
Posts: 23
Loc: Canada
Originally Posted By: Quattro Pete
I am not liking the 17-tooth JT front sprocket that I got for my Vulcan. It dropped the RPMs as it should have (factory sprocket is 16T), but it causes more drive train noise and results in more vibration that can be felt through the footpegs. The JT one does not have rubber dampers built into it like the factory sprocket does. I am going back to the stock sprocket next week.


I had the same experience with aftermarket sprockets. I went back to oem because of the rubber damper. It does make a difference if you spend a lot of time on the highway.

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#2599989 - 04/15/12 06:44 AM Re: Sprockets JT vs Sunstar [Re: Robenstein]
Mackelroy Offline


Registered: 12/03/04
Posts: 788
Loc: Florida /Texas
Most the rubber damped OEM front sprockets are made by Sunstar, if you buy a generic sunstar it wont have the rubber dmaping.

Personally I always bought the oem fronts, and after market rears. I ran aluminum rears for 20 years. I went back to steel and the longevity is Five fold over aluminum, Like that iron man Sunruh mentioned.

But the weight savings of aluminum is not worth it, the longevity and your pocketbook will be alot happier with steel.

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#2600836 - 04/16/12 09:13 AM Re: Sprockets JT vs Sunstar [Re: Robenstein]
sunruh Offline


Registered: 06/28/05
Posts: 1634
Loc: Cedar Park, TX
yeah i run oem fronts and high quality steels back.

i can put 3 - 4 years of racing on a ironman rear where alum is about 1/2 a season. oh and get any kind of dirt/grim/mud/sand on alum and its toast!
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