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Tom Lindsay
PostPosted: Wed Feb 15, 2006 1:49 pm  Reply with quote
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Joined: 18 Jun 2005
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Location: Longfellow, Minneapolis

Sorry Brooke, it took me so long to look up the numbers that you beat me to it. But yes, a kit, pipe, and some porting should make 80MPH without too much trouble, especially if it's a 175 or 200 that you're starting with.

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Derrick
PostPosted: Wed Feb 15, 2006 2:03 pm  Reply with quote
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Posts: 771

Draw a line toward the outside of your tire and roll it in a straight line on the floor. Make a mark on the floor when the line meets the floor 2 times. Measure the distance between your marks on the floor. That is the outside diameter of your tire. Your body weight, speed and tire pressure will change it slightly but this will be very close.
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nate
PostPosted: Wed Feb 15, 2006 2:46 pm  Reply with quote
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Posts: 587
Location: Best Saint Paul

Ok, ok. You guys are a bunch of whiners.
If I assume it's running 80/90 - 10s, which seems reasonable, that brings it up to:
53.6312" circumference
that works out to 1575 RPMs.
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Brooke
PostPosted: Wed Feb 15, 2006 5:40 pm  Reply with quote
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Joined: 06 May 2005
Posts: 215

or

http://www.scooterhelp.com/tuning/vespa.gear.calc.html

please support scooterhelp.com</PSA>
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My Pal Foot Foot
PostPosted: Thu Feb 16, 2006 2:35 pm  Reply with quote
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Joined: 03 May 2005
Posts: 73
Location: the metal house

To make things a little more difficult he is running an 8" tire on the front and a ET2 front tire on the rear. Figure that one out.
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some_dude
PostPosted: Thu Feb 16, 2006 3:15 pm  Reply with quote
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Posts: 300
Location: NE Minneapolis

My Pal Foot Foot wrote:
he is running an 8" tire on the front and a ET2 front tire on the rear.

That will make it faster and run at lower RPM's as it is always going downhill. You can't argue with gravity.
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Brooke
PostPosted: Thu Feb 16, 2006 3:47 pm  Reply with quote
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some_dude wrote:
My Pal Foot Foot wrote:
he is running an 8" tire on the front and a ET2 front tire on the rear.

That will make it faster and run at lower RPM's as it is always going downhill. You can't argue with gravity.


the front on an ET2 is a 100/80 which would give a tire height profile of 80mm which is actually lower profile than a 10X3.50 (about 90mm), though taller than 8X3.50.
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n8murphy
PostPosted: Sat Feb 18, 2006 11:41 am  Reply with quote
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Joined: 01 Dec 2005
Posts: 28

i am not thinking of dion this with my bike, but as it stands my bike has stock gears and should do 80 at 8000 rpms give or take but i cant get it to spin that fast in 4th so i am gonna put in a t5 fourth.
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