Hello, friends! I have a 2021 Triumph Tiger 900 Rally Pro. Suspension: Showa forks with 240 mm of travel in the front, 230 mm in the rear. Problem with the front fork (most likely). At any speed, the fork hits the steering wheel. It feels like you're riding on a washboard with large waves. Even on perfectly smooth asphalt, the steering wheel jumps up and down. It feels like the wheel is an egg, but it's almost perfectly round (we checked), I changed the tires three times - it didn't help. As the speed increases, the frequency of the steering wheel beating increases disproportionately. Then I found out on one forum that this problem is not isolated! What I did: 1. Changed the oil in the front fork. 2. Tried different fork settings. 3. I put on a new tire twice (I thought the first tire was defective), once a used one with a mileage of about 10 thousand km. The result is always the same. There is a beating, it is sometimes smaller, sometimes larger, but it is always there: when coasting, under load, when riding downhill with the engine off... This beating effect increases when riding with a deuce, with light braking with the rear brake. When loading the front of the motorcycle, the beating decreases, but does not disappear. Friends, has anyone encountered such a problem and how can I try to solve it? Perhaps there are suspension specialists here, I would really like to hear the words of someone who understands this issue. P.S. In all other respects, I really like the motorcycle, I don’t want to change it yet.
Has the bike ever been dropped or hit something front on have you checked the forks are in true alignment other than that have the brake discs been checked for wear or damage has the bike been off road and rode harder than suitable for the bike these are adventure bikes not trials and sometimes people forget that they do have limitations I am right in asking if you have had the actual wheel checked as trying a change of tyre out of all the components the tyres although are in touch with the road are the most plyable parts of the equation and so are most likely to absorb any defects so unless there is an obvious defect in the tyres I would not be surprised if your problem was twisted forks or damaged wheel
Wheel balance will give symptoms like this. When you changed tyres did you have the wheel balanced before refitting and not just rely on placing the dot on the tyre next to the valve?
The bike has not been in an accident or fallen. The fork is visually intact and without damage. It works great on a bad road. The problem is on smooth asphalt.
Naturally, after each tire change, I balanced the wheels (both front and rear) on a special machine. The chain is completely clean and lubricated, no defective links were found.
from 5 to 60 miles per hour. And this beating is not proportional to the speed. The most unpleasant experience is at speeds of about 30-40 mph.
If this also occurs on a smooth road at constant speed then the suspension is not being asked to do much so it is more likely to do with something that rotates i.e. the wheel. I assume it's a spoked wheel? I would be checking to see if there are any loose or broken spokes and that the wheel is not warped.
Yes, this ONLY happens on a flat section of asphalt. But even in this case, the suspension is subject to the force of gravity of the bike and the rider. The wheels are in perfect condition, the spokes are all in place.
Check the front to back wheel alignment. Align the rear wheel with the swing arm and frame using a long straight edge or the string method (don’t rely on the marks on the chain adjusters), then check the front wheel is in line and sits central using the same method.
