Speedmaster Vibration After Tire Change

Check your chain, does it have a dry or tight spot ? Only thing that could be wrong after a tyre change with those symptoms , or lessening or goes away when clutch is used.

 

It is most likely to be alignment and adjustment combined , just out !! Easy to do if the tyre fitter just backed off a smidge and returned to same after re-install , he just missed it by that much "

 

It might be worth getting the wheel balance checked.

 

Tight spot on chain maybe?

 

I have had exactly this problem several times, a 'thrumming' every second and a bit, when cruising at 50mph in 4th gear, but not 50mph in a different gear and not at any other speed. From my maths, vibration is happening at a rate less that once per wheel or chain revolution, so I was reassured it was some kind of resonance effect rather than any strictly mechanical problem.

I never did get to the bottom of things. It even persisted after changing chain and sprockets (which I did because they were worn, not to get rid of vibration). Only happens after rear wheel removal and goes away after a thousand miles or so.

 

BonnieRed
Yes it could be the balancing if rushed. And tyres are funny items each set has an preferred air pressure and don't work to well if under inflated especially. Had the same with my bonnie after fitting Avon's it was scary how the bike drifted so had the dealer pick it up. And it was the pressure they said don't look at the manual just use the pressures they had set and low and behold it rides fine now.
Joe.

 

BonnieRed
Sure thing. That's what its all about if we can help you today then tomorrow you can pass it on to someone else. And i have to agree with you there are some great nutters here in this asylum.
Joe.

 

I completely agree with that. On an open road there is the option of changing up to 5th gear, but you only remember to do that once have vibes kicked in and it's irritated you.

 

So, I've just been riding on a new tyre and have the vibration again, around 52mph in 4th gear. Not as bad as it has been on some occasions, but distinctly noticeable. Guess this is just a feature of the Speedmaster with new rear tyres...

 

Tyre pressure ! Bike manufacturer or Tyre manufacturer ! They are A Guide Only !! They base their recommendations on weight of bike plus AVERAGE rider ! When did you last meet an average Rider lol !

Then there is the variable types of road surface and how well it was made/maintained ! Plus how you ride ! Everyone's body english is different ( how you guide/manage your bike).

Me I suck it and see ! Plus 5 or 6 psi of recommended or minus 2 to 4 psi has always worked out as a starting point , if it's unsettled/unsettling try a different pressure ! Always reset at cold/start of the day !!!

 

I do, so any new tyre is exactly the same pressure as the one I replaced.

 

The only time I have had a similar problem is when I fitted my own tyres and never balanced them, just referencing the dot on the tyre wall in relation to the valve. I ended up buying a static balancer and haven't had the problem since. I always have tyres for the ZZR fitted and balanced at the tyre shop without problems.
I run the dirt bike tyres at varying pressures and it never affects balance or causes vibes.

 

Dunno if this could be it, but TWICE I had dealer macs install tires backwards. There is a forward rotation arrow on most tires. Sometimes the way the tread looks, it's counterintuitive and they install the tire in the wrong direction. The first time I felt it on the way home. It just felt squirrely. I took it back and they reversed the tires after I pointed out the error. The kid couldn't believe it. He said he never knew! The second time, having been burned once, I checked before I left the dealership and caught it there. The directional arrow is easy to miss, but it's likely there.