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John Schmidt
Member
Posts: 15260
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #1 on: October 14, 2011, 01:29:26 PM » |
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I think you mean 205/55/16, not 255....right? Anyway, I have 12" Progressive 412's on my ride with a 205/60/16 car tire. Rides & handles fine but I did have to do the washer mod on the rear fender to keep it from rubbing, I had previously removed the nut cage . I also have heavy duty springs set about in the center.
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crazydago
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« Reply #2 on: October 14, 2011, 01:38:54 PM » |
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 Whats the washer mod on rear fender consist of ?
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BF
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« Reply #3 on: October 14, 2011, 03:08:59 PM » |
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I can't help about the shape I'm in I can't sing, I ain't pretty and my legs are thin But don't ask me what I think of you I might not give the answer that you want me to  |
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Jess from VA
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« Reply #4 on: October 14, 2011, 03:24:15 PM » |
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You should have no problem with 12's instead of 13's.  You should likely not have to do the fender washer mod.... unless you are one of the lucky few.  |
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Tundra
Member
Posts: 3882
2014 Valkyrie 1800
Seminole, Florida
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« Reply #5 on: October 14, 2011, 03:49:54 PM » |
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I have 12" Progressive 440's on mine with a 205/60/16 car tire. Nutcage mod. and washer mod. |
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If you can't be a good example: be a WARNING!!
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sandy
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« Reply #6 on: October 15, 2011, 01:50:33 PM » |
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When you lower the rear of a MC, it changes the rake of the front end. The turning will be worse. Yes, you will affect the handling negatively.
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Grumpy
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« Reply #7 on: October 15, 2011, 08:05:52 PM » |
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When you lower the rear of a MC, it changes the rake of the front end. The turning will be worse. Yes, you will affect the handling negatively.
If you lower the rear, it increases rake. Raising the rear reduces rake. More rake, turns easier. |
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 Life is like a hot bath. It feels good while you’re in it, but the longer you stay in, the more wrinkled you get. |
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tmfp
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« Reply #8 on: October 15, 2011, 10:14:17 PM » |
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When you lower the rear of a MC, it changes the rake of the front end. The turning will be worse. Yes, you will affect the handling negatively.
If you lower the rear, it increases rake. Raising the rear reduces rake. More rake, turns easier. More importantly lowering the rear increases the trail, which is already long at 5.98" stock. This increases the tendency of the steering to 'flop' at low speeds. I rode a friend's Valk with progessives and it was quite noticeable compared to my stock setup. |
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Grumpy
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« Reply #9 on: October 15, 2011, 10:35:26 PM » |
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Tendency to flop at low speeds is right, but makes for less turning effort at higher speeds.
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Life is like a hot bath. It feels good while you’re in it, but the longer you stay in, the more wrinkled you get. |
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donaldcc
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« Reply #10 on: October 16, 2011, 06:21:15 PM » |
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When you lower the rear of a MC, it changes the rake of the front end. The turning will be worse. Yes, you will affect the handling negatively.
If you lower the rear, it increases rake. Raising the rear reduces rake. More rake, turns easier. Tendency to flop at low speeds is right, but makes for less turning effort at higher speeds.
More RAKE = More TRAIL Am I mistaken? ??? My understanding is that increasing the trail makes bike more stable at speed and INCREASES effort to turn. Shortening trail (sport bikes) decreases effort to turn thus making them more maneuverable than the Valk.  [quote
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Don
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sandy
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« Reply #11 on: October 17, 2011, 05:33:04 PM » |
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Donald is correct: If you rake out the front end, The bike becomes stable for straight line riding. But it won't go around corners very well. Steeper rake angles increase cornering ability but may require the rider to be more on his/her toes. Therefor, raising/lowering the rear of a bike changes the way it handles. I prefer better cornering. No lowering the rear for me.
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MacDragon
Member
Posts: 1970
My first Valk VRCC# 32095
Middleton, Mass.
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« Reply #12 on: October 18, 2011, 04:45:18 AM » |
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I'm a short guy... 5'8" on a good day. I put 11.5" 412s on the back of mine and notice no ill effects. Rides and handles just fine. More nimble than my Ace.   |
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 Ride fast and take chances... uh, I mean... ride safe folks. Patriot Guard Riders |
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