| Author | Message | ||
     Raymondt |
I ride an XB12S and ever since changing from my old set of Michelin Pilot Roads which have always been great, to the new dual compound Pilot Road II's I now have instability at speeds 100 mph or greater. It was never an issue before, but now seems like a high speed tank slapper may be eminent with a wobble. Does anyone have any ideas for a fix? I am running the same stock size and factory recomended pressures with the same suspension settings. | ||
| Theirishbueller |
Did they balance the tires when they put them on? | ||
| Raymondt |
They mounted and balanced them, then I put them on. | ||
| Billyo |
I haven't heard of any problems with the PR2's. I really like them on my 'Bolt but I rarely go over 100. Check all your torques again and if there is nothing wrong have them re-balanced. Have you messed with the suspension settings? | ||
| Raymondt |
I have not changed anything yet, I was hoping that some one might have an idea as where to start. It was fine to 130+ with the worn set. You really think an imbalance would cause a stability issue? i was thinking I may need to compensate for a slightly different profile. Possibly changing fork tube position or ? | ||
| L8_br8ker |
If your tires are out of balance, you will have bad stability issues, ask the shop what method was used to balance them, if they use static, it probably isnt good enough, I would check the balance first, if your other settings were good before the change. | ||
| Billyo |
I just performed a little non-scientific test on the "dyna beads" thread on Quick Board. On my Uly's front tire I put 1oz of weight and it wasn't very noticable. Fifteen miles later I then added 1oz more and it was only a little more noticable. After thirty more miles I really didn't notice it that much anymore but then when I took the weights back off I realized how much smoother it was. My speeds only reached around 80mph so if you're going 1 1/2 times that fast the difference may be immense. If you haven't screwed with the suspension the balance may be the problem. I really like the PR2's. with almost 4000 miles I'm barely seeing any wear. Again, speed probably has an effect on wear too. | ||
| Delta_one |
I just had my PR2's up to 110 today on my lightning smooth as silk but I run the pressures up higher, I go off of the sidewall of the tire 44 or so psi I think. I made no real changes from my PP2's other than slight dampening adjustments to compensate for the higher tire pressures. | ||
| Chessm |
i went from pilot roads to pilot road 2s on my XB and ive suffered no detrimental changes to the bike's handling i got all the 'new tire' benefits like the sharper profile but stabilty hasnt suffered at all at 100+ mph speeds. id look into suspension settings and pilot error. maybe you are gripping the bars too tight. | ||
| Glitch |
http://www.sportrider.com/tech/146_0006_susp_troub le/index.html | ||
| Teeps |
The forks may be binding do this: Loosen the front axle pinch bolts on the fork. Then bounce the suspension several times. Then torque the pinch bolts. | ||
| Raymondt |
Thanks everyone! I will try Teeps, remove the bind method. If that doesn'e work I will back off the rebound dampening some, and if none of that works I pull the wheels and take them in somewhere else and get them rebalanced. | ||
| Nightripper |
tire balance or check to make sure that they did not put them on backwards as tires are directional | ||
| Glitch |
(Message edited by glitch on June 13, 2010) | ||
| S10darkascanb |
out of balance tire will show signs more as speed increases. Can you see any abnormality in the scrub in on the tire itself? Definately check the rotation and feel the edges of the grooves as well for feathering or waves. could help determine. | ||
| Speedfreaks101 |
Glitch that is incorrect. The wheel weights should be on the same side as the rotor on the front wheel. This was actually an issue that I ran ran into once. I had some tires mounted/balanced locally. When I took it for a ride my hands started to go to sleep. Once the tires were broke in I found that I had an issue with the bike wanting to tank slap. It was due to the fact that the wheels were balanced wrong and the weight had been split. One half of the weight was on the rotor side and one half was on the left side. ALL the weight should be under the rotor. So I ordered a balanced and once corrected no more numbness and no more slapper. | ||
| Glitch |
Glitch that is incorrect. Yes I was. By the book, it say to place the weights on the right side of the wheel. My bad. Not sure how I got mixed up, I guess I should have quoted the book rather than my memory. | ||
| Rsh |
The manual states the preferred location for installing the weights. I don't think it really matters what side of the rim the weights are on. I have seen plenty of XB and 1125R race bikes with the weights on the front wheel on the non rotor side including my own, and never had a problem, and riding much faster than street speeds. Splitting the weights is a different issue. How much weight was needed to balance the wheels. The weight spec is: 1oz max front, 2oz max rear. Is the tire or tires completely seated on the rim. Also check the wheel bearings, seems like a number of people are having problems lately. (Message edited by rsh on June 14, 2010) (Message edited by rsh on June 14, 2010) | ||
| Raymondt |
So I tried teeps remove the bind method. and added a half oz. on the non rotor side. Now at one OZ total. I also backed out the rebound dampening a half turn. Anyway it is still there but not as pronounced. I did note in testing that it is common for me to assume the flat track position when actually hauling ass racing a rice rocket or whatever. You know where you only hold the throttle with your right and tuck in and hold the left front fork with your left hand? An instant human steering stabilizer! Had it to 135 before I ran out of road. I am now however afraid to sit up! All bearings look good. Still not as good as the old tires. of course these were expensive and promise long life. | ||
| Firebolteric_ma |
Remove tires, place on wheel balance, balance tires & re-install. Make sure that everything is "Squared" up & axle slides in with little to no force. If this was done correctly start to check Wheel bearings, forks are squared up & flush, settings are correct, & neck bearing is correctly torqued. Sure your rim is good & not tweaked? These bikes have such a good rake that little adjustments make big changes in the way they handle. |
