Has anyone used Tryker tyres? I suspect that the tooth-rattling\nride was due to them being fitted (and at 60 psi) when I was riding\nover roughish tarmac, and that definitely cost me some speed in\n'rolling resistance'. They are also NBG on leaf litter up a 1:10\nslope.\n\nAnyway, I did 4 rides on the recumbent, interleaving 2 up the upright,\nand was was only c. 8% slower on the former at c. 10 MPH up a 1:50\nroughish tarmac road. Allowing for inexperience, lossy tyres, not\nable to stretch my legs, that's close enough for horseshoes.\n\nWhat I wasn't able to test properly was how steep a slope I could\nride up, because the standard model of ICE doesn't extend quite far\nenough for me. I wasn't prepared to risk knee damage by trying.\nBother.\n\n\nRegards,\nNick Maclaren.