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@dooks
hi,
i bought a new genesis flyer a few weeks back, my first fixed gear bike in about 8 years (had a beautiful old carlton flyer fixed back when i was pedicabbing). I got it set up fixed 48/16 with SPDs and plan to use it as a platform to tweak. like i said it had been a while since i had ridden fixed so I was easing myself in. Having got some confidence up i've been skidding and messing about the last week or so until at the week end i went to pull a skid on friday and i had this big jarring jump like the chain had skipped or something the pedals spun back about a quarter turn and I popped out of my cleats and nearly came off.
a few minutes later while getting stuck in going up waterloo bridge the opposite thing happened - it was like the sensation of the drive chain suddeenly slipping in the other direction a quarter turn. like doing a sudden and unexpected wheelspin. again, i very nearly came a cropper.
the bike was new so i took it back to cycle surgery where i bought it for the free first service (what the hey, it's free) and they assured me they'd sorted out the stretched chain, missaligned wheel and dodgy lock-nut.
then the same thing happened this morning. and thee times tonight. every time i brake hard or skid i think the rear cog is coming suddenly unscrewed... then whenever i get back on the power it slips the other way. it's nearly un-biked me a good half a dozen times now and is really sapping my confidence. any idea what's up or what to do? new lock-nut? superglue? just unweight more and stop putting so much force through the thing?
sorry i keep writing such long posts for a noob btw. i'm feeling verbose today for some reason. brevity will be my byword in response to any gratefully appreciated replies.
thanks,
dooks.