New Michelin PR4s - Twitchy at Speed, And... - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 17 Old 05-06-2014, 06:32 PM Thread Starter
MRV
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New Michelin PR4s - Twitchy at Speed, And...

A little over two weeks ago, I got a new set of PR4s mounted up. Quickly noticed that the bike handled much more ...lightly for lack of a better word. Kinda pleasant.

Then I noticed that at speeds approaching 90, the handling became downright twitchy. OK... I don't ride at those speeds much, anyway.

Then I got on the interstate, and found myself closing on a semi ahead of me. When I got to within maybe 400 feet, the bike started a nasty bob-and-weave head shake. Took all my attention to keep it pointed in a straight line while I got around the semi. And the next. And the next. The bike had never exhibited any such decrease in stability with the OEM Trail Wings.

I can't see where anyone else has reported anything similar here. So I guess I'm the only one. Suggestions are appreciated, but I'm not going to install a fork brace to solve a problem that didn't exist with the OEM tires.

Thanks!

---2016 FJR1300 ES.
---Previous bikes: 1970 Honda CB100; 1972 CB175; 1973 CB350; 1975 CB550; 1977 CB750; 1978 Yamaha 750 Triple; 1980 Goldwing; in and out of the sport on an FT500 Ascot and an assortment of 1980s four-cylinder Hondas in the late 80s and early 90s; 1995 Honda 750 Nighthawk; 1999 Suzuki SV650; 2002 Honda 750 Nighthawk; 2012 DL1000 V-Strom; 2010 FJR; 2014 Yamaha Super Ténéré ES.
---IBA #56124. Two SS1Ks, one BB1500, one BBG; placed 9th in MERA's 2014 Five & Dime 5-day rally (solo class).
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post #2 of 17 Old 05-06-2014, 07:06 PM
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Quote:
Originally Posted by MRV View Post
A little over two weeks ago, I got a new set of PR4s mounted up. Quickly noticed that the bike handled much more ...lightly for lack of a better word. Kinda pleasant.

Then I noticed that at speeds approaching 90, the handling became downright twitchy. OK... I don't ride at those speeds much, anyway.

Then I got on the interstate, and found myself closing on a semi ahead of me. When I got to within maybe 400 feet, the bike started a nasty bob-and-weave head shake. Took all my attention to keep it pointed in a straight line while I got around the semi. And the next. And the next. The bike had never exhibited any such decrease in stability with the OEM Trail Wings.

I can't see where anyone else has reported anything similar here. So I guess I'm the only one. Suggestions are appreciated, but I'm not going to install a fork brace to solve a problem that didn't exist with the OEM tires.

Thanks!
I suspect that new Trail Wings would be similar- New tires have smaller radii cross-sections (some say "rounder"). I had similar experiences when my bike was new, but over time it diminished. Your windscreen and bags greatly affect what is going on as well- did you put them on after a couple of thousand miles on the TW's after they had been worn flatter?

You could also play with tire pressure. I like to run 35 in my Shinko 705's, but a bit less with the TWs.

You need a fork brace anyway. I noticed a significant improvement immediately and I ride the slab every day. Don't be a denialist.
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post #3 of 17 Old 05-06-2014, 07:20 PM
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Such handling issues at speed can involve the aerodynamic angle of attack, loose steering head bearings and/or wonky front tires. Fork braces help. Lower the front by raising the fork tubes in the triple clamps 10-15mm. Check the steering head bearings.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #4 of 17 Old 05-06-2014, 07:33 PM
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I've got about 650 miles on my PR4s, and have had occasion (and I'll deny it if pressed) to slightly exceed prevailing limits by a couple of mph... (or more). I've hit triple digits once or twice for the express purpose of checking handling (open highway, no traffic, certainly no trucks around). It stayed planted, straight, and true like it was glued to my line.

That being said, I have my forks raised 19mm to match my 3/4" links, and there was a noticeable increase in stability both at speed and in cornering. So, I 2nd greywolf's suggestion... At least as a checkbox...

[B][I]Barry[/I]
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
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GPI spools, SW Motech risers
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post #5 of 17 Old 05-06-2014, 07:39 PM
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The Glee is a different beast. It doesn't have the plastic ramp under the headlights that causes lift and its longer shock already lowers the angle of attack. Vees and Wees have significant lift on the front at speed that is even worse with headwinds or being in the slipstream of large vehicles. I feel it is important to at least try lowering the front. It's not that difficult, free, and reversible if it doesn't help.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

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post #6 of 17 Old 05-06-2014, 09:10 PM
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Although new tires can feel twitchy, the only things that have changed are the tires, mounting, ballencing and installation. I'd double check that the tires are mounted in the correct direction, rear sprocket alignment is correct and adjusters are tight, axles and pinch bolts are torqued, visually inspect tires for defects and ballencing weights, and manually rotate tires while on centerstand while looking for abnormalities.
Then raise the fork tubes and install a fork brace. Both of which are needed on this bike anyway for stability reasons

'09 VEE
'07 HD SEUC
'09 ST1300P
'06 ST1300
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post #7 of 17 Old 05-06-2014, 09:32 PM Thread Starter
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Thanks, guys. I'll do the suggested checks in a day or two and see what I can find.

---2016 FJR1300 ES.
---Previous bikes: 1970 Honda CB100; 1972 CB175; 1973 CB350; 1975 CB550; 1977 CB750; 1978 Yamaha 750 Triple; 1980 Goldwing; in and out of the sport on an FT500 Ascot and an assortment of 1980s four-cylinder Hondas in the late 80s and early 90s; 1995 Honda 750 Nighthawk; 1999 Suzuki SV650; 2002 Honda 750 Nighthawk; 2012 DL1000 V-Strom; 2010 FJR; 2014 Yamaha Super Ténéré ES.
---IBA #56124. Two SS1Ks, one BB1500, one BBG; placed 9th in MERA's 2014 Five & Dime 5-day rally (solo class).
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post #8 of 17 Old 05-14-2014, 02:50 AM
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I got to say my new P4 are great . No wobble at 100 MPH on a private road of course . Slight road noise but al in all a great ride. Tyre Pressure 34F 36R

DL650 Pearl White 2012

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post #9 of 17 Old 05-14-2014, 09:22 AM
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Quote:
Originally Posted by BODIE37 View Post
Tyre Pressure 34F 36R
With those tire pressures, are you riding solo or 2-up?

Lighten up, Francis. If you can't take some sarcasm, an Internet forum is the last place you should be.

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post #10 of 17 Old 05-14-2014, 09:44 AM
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I ride 34/37 w/ the PR4s. The Pilot Roads always seemed to like an extra lb. That's solo. I'm 185-190lbs. (depending on dinner the night before).

[B][I]Barry[/I]
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
Madstad windscreen
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags
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