"Bounce" at low, constant speeds

[Piet]

Hi guys,

My KLR has developed a bounce at low constant speeds. While accelerating and at higher speeds the bounce is not that noticeable, but at any constant speed between 30 and 60 km/h the bounce is significant. No left-to-right movement, only up and-and-down oscillations.

I initially thought it might be tire balance, so I replaced the rear tire on Friday and had the HD tube in the front replaced with a normal tube (same tire refitted). Both wheels were balanced and refitted at JustBikeTyre.

The bouncing persisted after the tire change, so I did a bit of reading. Seems it can be any of the following:

• Tire pressure (unlikely, but I'll check)
• Tire balance (unlikely - I witnessed them being balanced on Friday)
• Tire not properly seated (unlikely)
• Spoke tension and thus wheel truing (never checked, but never been a problem)
• Worn chain/stiff links (my chain is only about 15000 km old)
• Suspension issue (unlikely, fork oil is 8000 km old)
• Triple tree tightness
• Steering head bearings shot
• Wheel bearings shot
• Brake caliper catching on brake disk (possible, my previous set of front pads only lasted 3000 km!)
• Wheel alignment

Any tips/comments/additional things to look out for?

 

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