Update--170/80 tire mod with Scootworks front pulley - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 19 (permalink) Old 07-31-2010, 04:55 PM Thread Starter
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Update--170/80 tire mod with Scootworks front pulley

A few months ago I posted that I'd changed from 180/70 to 170/80 tire to get a taller profile, higher geared setup.

Some doubted that this tire would have sufficient clearance if Scootworks front pulley was installed.

Today, I mounted the Scootworks pulley. The wheel turned freely for the full rotation, but when I ran the bike at 90 mph on the jack, the centrifugal force increased the tire diameter enough that the tire rubbed slightly on the black plastic splash guard that sits between the monoshock and the wheel. The tire picked up a little friction-heated plastic from the spash guard.

I'm running a Pirelli Mt66 rear with about 6000 miles treadwear on it, so a new tire would be even larger in diameter, and exhibit the problem to a greater degree.

I believe that if I ride the bike on the road long enough for the tire to heat up on the roadway, that the rubbing will be even worse.

My conclusion is that if you wish to run the Scootworks pulley with the 170/80 tire, you must either rework the plastic splash guard or run both front and rear Scootworks pulleys.

Time to go put the factory pulley back on...

2007 VN900LT, red/titanium
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post #2 of 19 (permalink) Old 08-01-2010, 10:12 PM
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That sucks. Would a 200 be too large then? Or do they have a smaller diameter then the 170? Cuz I thought they were larger then the 180.

I have heard that different brands of tires will change in height too. Like the AVON 230 is taller then the Metzeler 230. Which is weird. But I guess the sidewall height is the same but the way they do the curve on the tread is different.

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post #3 of 19 (permalink) Old 08-02-2010, 12:38 AM Thread Starter
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200 is even a little larger in diameter than the 170/80, that won't work, either.

I could get the 170/80 to work if I were willing to remove the black plastic fender shield.

2007 VN900LT, red/titanium
OEM highway bars and luggage rack
OEM WS lowers
4.5 inch pull back risers
Kuryakin highway pegs
Stebel air horn
Utopia driver backrest on OEM seat
OEM gel seat for about town, and hauling grandkids
ISO grips
Jardine light bar
K&N air filter
Brakeaway cruise control
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post #4 of 19 (permalink) Old 08-02-2010, 01:23 AM
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Quote:
Originally Posted by mbwarner View Post
A few months ago I posted that I'd changed from 180/70 to 170/80 tire to get a taller profile, higher geared setup.

Some doubted that this tire would have sufficient clearance if Scootworks front pulley was installed.

Today, I mounted the Scootworks pulley. The wheel turned freely for the full rotation, but when I ran the bike at 90 mph on the jack, the centrifugal force increased the tire diameter enough that the tire rubbed slightly on the black plastic splash guard that sits between the monoshock and the wheel. The tire picked up a little friction-heated plastic from the spash guard.

I'm running a Pirelli Mt66 rear with about 6000 miles treadwear on it, so a new tire would be even larger in diameter, and exhibit the problem to a greater degree.

I believe that if I ride the bike on the road long enough for the tire to heat up on the roadway, that the rubbing will be even worse.

My conclusion is that if you wish to run the Scootworks pulley with the 170/80 tire, you must either rework the plastic splash guard or run both front and rear Scootworks pulleys.

Time to go put the factory pulley back on...
What are you gonna do with that pulley? Sell it?

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post #5 of 19 (permalink) Old 08-02-2010, 09:51 AM
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If you put the pulley on with the 180 tire, there will be no rubbing (personal experiance). You also will eliminate the need of a larger rear tire. I run the pulley, have better performance and my speedometer is only 1 mph over at about 60-70 mph (as opposed to 6-7 mph over). If you want more after that, then yes, go with the rear pulley as well. I would suggest that after you wear out the 170 tire, you reinstall the front pulley and run it with the stock tire. Considering the 180 generally runs about $25 less than the 170, the pulley could help you save a few bucks and pay for itself in 3-4 tires.... IMHO...

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post #6 of 19 (permalink) Old 08-02-2010, 09:52 AM
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Thanks for the update. I had been following the original thread closely.

https://www.vulcanforums.com/forums/s...ead.php?t=7832

A wealth of info here for anyone considering the pulley/taller tire.

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Last edited by silenthill; 08-02-2010 at 09:58 AM.
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post #7 of 19 (permalink) Old 08-02-2010, 10:48 PM Thread Starter
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My experience was that the 170/80 is about $25 cheaper than the 180/70.

I haven't decided whether I'll go with the 170/80 tire and sell the pulley, or put the pulley on along with a 180/70 tire when the present tire wears out.

I'm leaning towards pulley plus stock tire.

2007 VN900LT, red/titanium
OEM highway bars and luggage rack
OEM WS lowers
4.5 inch pull back risers
Kuryakin highway pegs
Stebel air horn
Utopia driver backrest on OEM seat
OEM gel seat for about town, and hauling grandkids
ISO grips
Jardine light bar
K&N air filter
Brakeaway cruise control
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post #8 of 19 (permalink) Old 08-17-2010, 11:39 AM
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I purhased my 2006 classic used and I knew the tire was not stock. It has a 200/70 15 tire and from what I'm reading the pulley I just ordererd will not work. Is the modification to the black plastic fender shield worth it?
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post #9 of 19 (permalink) Old 08-17-2010, 01:02 PM Thread Starter
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I don't think it will work. The 200/70 is 4 mm taller in radius, a little over 1/8 inch, than the 170/80.

2007 VN900LT, red/titanium
OEM highway bars and luggage rack
OEM WS lowers
4.5 inch pull back risers
Kuryakin highway pegs
Stebel air horn
Utopia driver backrest on OEM seat
OEM gel seat for about town, and hauling grandkids
ISO grips
Jardine light bar
K&N air filter
Brakeaway cruise control

Last edited by mbwarner; 08-17-2010 at 01:13 PM.
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post #10 of 19 (permalink) Old 08-17-2010, 06:29 PM
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Thanks for the info mb, I will take a serious look at the situation and make a decision. I probably will install it and see if it will work and probably modify the splash quard. I have a Metzeler tire and I thought I read a thread that it may still work. One question I have is since I never exceed 80mph combined with my 240 weight the tire should not expand to the diameter needed to start rubbing?
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