I fell off my bike today. I was merrily cycling along in a straight line then boom, I hit the deck and skidded along the road. I was cycling over fresh snow and can only hazard a guess that I had inadvertantly cycled on compressed snow that had turned to ice and them been covered over with this fresh batch of snow. No damage to myself, as for my bike, it seems ok. One of the cable ties holding my pump holder came off, my SQR block moved (no damage to Carradice, just wet and covered in snow) and I've lost the end cap for my bar end. This annoys me, I hate missing end caps. I didn't notice till I had pedalled off. I might flash a torch on the impact site on the way home on the off chance it hasn't been buried under more snow or crushed by a car. My pride is unscathed as there was nobody about. So onto the subject of tyres. I usually would have put my 2.1" knobblies on by now but I totally forgot about them and have been happily pootling about on 1.6" slicks. I hate the 2.1" knobbles as it feels like it's faster to walk and I always get in a huff trying to swap my tyres over. Would there actually be any benefit in traction with knobblies or would I have fallen on my arse in this instance anyway? I want to know if the trauma of tyre changing is worth it. Also I've seen one person cycling about with one slick and one knobbly. I think the knobbly was on the front. What is that all about? Surely 2 different type tyres presumably different widths is more of a hindrance than a benefit?