Its not on a GS, but
this video of a TKC70 hardly inspires confidence. My gut feel is that Conti have had some pretty bad quality control on a tyre that has seen high demand at the point of release, and that the issues have been more evident on certain types of bike. Unfortunately Conti haven't said anything publicly, but hopefully they'll sort out the issues and stories of bar shake will disappear in time.
This is very interesting to hear. I was going to start a thread about my set of TKC 70's and the WOBBLES.
I bought a 1200GSA 2011 2 months ago in France and it had pretty worn out Tourances on it that handled ok.
I was expecting to do some overlanding around Turkey next year so I had the TKC 70s fitted. At first it was nice to just have new tyres on - much greater agility at low speeds. BUT when I got up to speed on the motorway I was amazed at how unstable the bike felt, even at 125KPH - and just forget about over 135KPH. I've had a few GS bikes, including a present Water-cooled in Sydney, so I know what they r capable of. And if I hadn't already done some high-speed riding with the balding Tourances I would have sworn there were fundamental problems with the frame/shocks on this latest purchase.
Long story short - I have now completed a Balkans trip and ridden from Nice to the UK and the stability issues are better but not good enough. Also, the bike seems to lean into left-handers better than right-handers and this was very pronounced at the start - less now.
I've done around 5000 kilometres on these tyres now I think and I want to contact Continental and tell them I'm NOT happy AT ALL. Speaking of which, does anybody know how to do that? I did try and search for a contact in France and didn't manage it.
The tyres seem ok off-road but no way does that make up for the high-speed instability. They do seem to grip very well on corners on bitumen, no complaints there. Would I recommend these tyres - no way, not until I resolve what the issues are.
Nearly forgot - just after I bought the tyres in Nice my mechanic there said he didn't think the TKCs were good and actually felt that Conti were losing the plot. He's had a couple of customers complain about them and switch back to Tourances with great relief. I ignored it because each to his own and our riding styles are often quite different but I do believe Continental have a real problem with these tyres, especially after reading the above. Bit of a relief actually - there is always the suspicion lurking that there's an issue with the bike or, worse still, the operator !
Given my experience is so bad should I start a new thread on this? And if so, which section would be the best where it will get most attention? I really do think this needs discussing - getting nasty wobbles at 130 KPH on expensive tyres is absurd.
thanks