hi I use tkc 80 front, heidenau k60 scout rear . I found fitting the tkc80 on the front changed the handling significantly in a good way particularly off road, they hold a straight line better on gravel etc. They did at first feel very strange at very low speeds on roundabouts on tarmac but you soon get used to it. my front tkc80 has now done 6500 miles and still has plenty of tread left the rear scout has done 5500 miles and I estimate has about another 2000 miles life left. Make sure you bounce the forks up and down before you tighten the front axel pinch bolts it seem to help the fork alignment.