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Aligning forks and rear tire.

1.7K views 13 replies 7 participants last post by  JonnieBlaze  
#1 ·
Hey everyone.

A couple weeks ago I laid my bike down at about 10 mph in a turn (due to a combination of newbie front brake control and gravel). On the way home I noticed every time I used my front brakes, the bike would pull left pretty hard. My bike mechanic just said to pump the brakes really hard 10 or 15 times and that should fix it. I did that, and it worked. No more pulling to the left when I hit the brakes.

Later, I pulled my front and rear wheels off to have the tires changed. Now they are back on and I've got the fairings fixed up so I'm riding again. But now whenever I let go of the handle bars, the bike goes left. Even if I lean right to counteract the pull, the bike just barely goes straight.

Now I don't know if this happened after I dumped the bike, or after I put my wheels back on. So I wanted to figure out first how to align the rear wheel. Do you really just align the axle with those graduation markings on the swing arm? If so the rear wheel is properly aligned. So onto the front forks/axle.

Eye balling the front forks from every angle I can think of everything looks straight. I've never had any sort of wobble at high speeds. I'm guessing they might just be ever so slightly tweaked out of a alignment somewhere. I've probably found 7 different ways to align everything up front and I'm not sure what to believe. One method I found was using a piece of glass on the forks to see if it will lay flat on them then adjusting them accordingly. But that how-to didn't really explain which triple clamp needed to be lose, whether the axle needed to be lose, fender removed, etc. Is there a tried and true method that you all recommend?
 
#6 ·
This works fine. If you want to take it a step further, run a string between the front and rear axles and measure the difference, if any, between the center-to-center of the axle. This is easier and more accurate with the rear wheel in a wheel stand and the front positioned perfectly straight.
 
#3 ·
Recently I had a similar problem and was advised to just loosen up the lower triple, shake the handlebars around good, bounce on the front wheel a couple of times and tighten em back up... seriously. Bike seems to be good now. Of course I later figured out it was just a crooked clip-on that made it look all jacked up. Good luck man!
 
#4 ·
ok some of you might call me stupid on this one and im not saying the OP is wrong...

but i cant see how the forks can be out of alignment unless something is bent or broken. if you have the axle in and the triples are good, shouldnt it make one big rectangle in a sense and not be out of alignment.

someone please explain..im up for learning something today
 
#12 ·
I have this tool from Motosport, it is a clamp that attaches to the rear sprocket with a metal dowel about 8" long protruding from the end. You clamp it on and lay the dowel along the chain or better yet sight down the length of the dowel to the countershaft to easily check rear alignment. Granted, the motor could be off in the frame but I haven't found this to be a factor yet. Makes for easy checks, found the swingarm marks at least a bit off on every bike I've checked.
 
#14 ·
Just to finish up this thread, I found the problem to be the rear tire. Everything upfront was fine and I didn't have to adjust anything. But the rear tire was off just a hair. I put a rod through the swingarm pivot and measured from there to the center of the rear axle on both sides. Now it stays straight whenever i let go of the bars :)