Insert any of the following here:

"on private roads under controlled conditions"
"on my recent trip to Germany/The Isle of Man"
"kph"
"in my mind"

I don't know about anyone else, but I rag the preverbial tits off both my bikes.... Everywhere, all of the time. OMG! Irresponsible is my middle name, I love doing wheelies too.... And I used to be called ghost rider.

Ok so the last bit isn't true! The point is who cares... Freedom of choice and all that... And now I've hijacked the thread! Doh!

So speed wobble on tkc 80s..... Mmmmmm they shouldn't do that should they, wherever you're speeding?!!!!

......and I said tit's. Doh!

Not had my TCK's above 35 (legaly) yet here on Guernsey but correct tyre pressure and more preload seem to be the things to check.

For high speed weave I had some at 85-90 incidated on BT45 so it's not just limited to the tck's (though they are worse)

@Mech - It might be worth checking your stearing head bearings. I've just taken in my bike to the local dealer with similar problems (including a pronounced 35mph weave) and seem they need adjusting if not replacing.
I'm also wondering if the grease levels were low as after him testing them the problem seems a little better at the moment so presumably some grease has been loosened/moved
(I've got it booked in to be sorted next week so not had my fix for this yet)

Will mention it at the service tomorrow.... I have had the front wheel in the air and it went lock to lock without any notchiness or stiffness...

I removed the TCK80 from the front of my bike yesterday. It had a very hard life and was completely goosed.

The wear on it was very odd indeed and compared to the new tyre, all of the blocks were much larger on the old tyre! The tyre was also much wider at the tread.

Cornering with the old tyre was a nightmare, you had to apply a little counter steer to get it to lean (as normal) but then turn into the corner to get the bike round, very unsettling, like riding an off-road knobbly on the road.

Removing the tyre was the easiest ever, the bead broke by hand, and I used 1 tyre lever to get the bead over the rim, then pulled the tyre off the wheel, again by hand. The sidewalls had no stiffness in them at all, I've seen MTB tyres with more strength.

Looking at the tyre, you can press every block of the remaining tread right inside the carcase of the tyre. It's very bizzare, I've never seen a tyre go bad like this.

When I put the tyre back on the bike, I had to raise the front of the bike further off the ground, so despite there only being 5mm difference in tread depth, the old tyre had 'squashed' meaning the difference in radius was around 30mm.

Having said all that. The old tyre had done god-knows how many very hard miles on the trails of potrugal, sometimes at speeds of 60-70mph. but the degridation was very strange.

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Never underestimate the power of stupid people in large groups.

The mechanic checked my bike front and back and found no problems either but aparently didn't even get off the forecourt before noticing the problem on the test ride!

@gulgo - seems the sidewalls had lost most of its rigitity, hence being fatter, which is why they were such a mare before you changed them?

the tenere has no steering dampers
unlike sports bikes its made for static steering offroad which you cant acheive with dampers, expect DANGEROUS speed wobbles when doing 80+ in certain conditions, -looks at road rash scars- my DT 125 X supermoto flung me off during a high speed wobble a few years back, be careful guys the bike DOES wobble if you dont weigh too much and are going fast in my experiance

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Yamaha XT 660 Z T�n�r� 2009 black, Polisport Off-road front mudguard, Givi tall screen, Givi luggage rack, Yamaha top box, Touratech Hand Guards.

I've run my TKCs right down now, the rear is just under legal limit and the front blocks are very wedge shaped.......... I've been riding my X for a few weeks, but jumped on the Z for a couple of days and nearly shat myself. I must have been riding round what are very nasty wear effects. I had noticed that the front under braking felt like it had started to feel like it was stuck in a rut, well it is so bad now that the bike needs over correcting to make it pull up straight. The rear is letting go with just a whiff of dampness, which at this time of year is almost all the time. When cornering it feels like its falling into the corner and then it hits a 'ridge' at which point it just feels like its going to go down.
Obviously I have run the tyres to their limit and beyond, but its worth noting that unlike more road biased tyres these need to be changed before they get to the legal limit.