I meant mini-pins... If you remove the outside two and inside two rows of spikes on a mini-spike you end up with a slick
In the UK you guys seem to run indoor races on a load of different surfaces. In Germany it tends to be all carpet, so the grip is pretty high all over.
After having seen the York video were are going to blatantly try and copy some of the jumps this weekend
I'll try and post some pics