Join Date: Jan 2010
Location: Northeast Oregon State
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
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
Jardine light bar
K&N air filter
Brakeaway cruise control