Bonnie With A Weave

Worth checking tyre wear and pressures. Where you sit on the bike can affect
this too. Tight steering bearings or other chassis bearings. If tyres bearings etc good Maybe go somewhere traffic free and run up to that speed and see what happens with a slight wiggle of the bars. Move on the seat to see what
affect that has. Also maybe when overtaking a bow wave may have affected stability.

 

Check forks for any signs of misting. I had an X11 that lost oil on one side and the bike was a bucking bronco at speed.

 

That was always an issue with GSX1400 - scrotes just love to play with knobs etc

 

Same sensation when passing an 18 wheeler ( lory ) on a beemer with a top box. Nothing wrong with the bike, just the way the wind whips with a top box.

 

Benbo
What I usually do as well is loosen the mudguard bounce and twist the front forks sometimes it just evens things up at the front. And make sure the forks are dead level in the head stock and correct oil levels and correct grade oil.
Ride Safe
Joe.

 

My 1000 vstrom used to corkscrew at 80 plus when fully loaded with luggage.
Wessa

 

I would be amazed if there is an issue with the bike itself. As already mentioned my money is on air pressure changes before, during & after overtaking the lorry. It would be very easy overthink this & allow this experience to mess with your head whilst riding.

 

T100 SE? What manner of hybrid is that? Wheel size?

My R100RS was very steady but overtaking some trucks could induce a weave but ONLY when the panniers were fitted.

 

I would say with some certainty it would be the top box and the wind turbulance when overtaking

 

The problem is always the topbox! Comes under the heading "cruelty to a Bonnie"!

 

In an effort to reduce bike weave with luggage fitted some bike manufacturers top box racks are a sliding carriage, including Triumphs.
In other words with the top box fitted to a sliding carriage the top box will move slightly sidewards with varying side wind pressure in an effort to reduce bike weave.

 

It's gods way of telling you Top Box's are fugly and have no place on a beautiful bike like the Bonnie

True fact, hope that helps