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Me and some friends have just moved down to London and are looking for the best places to go and buy some cheap road bikes and parts... any suggestions?

Has this gone? Dibs if not

I tried flipping the larger cog on the chain ring and putting it in the place of the smaller cog.. with the addition of washers it seems to have worked perfectly!

Weaving my way through a busy highstreet doing my thing when.. CLudakngak...looks down yet again my chain has impossibly wrapped itself around the cog.

The outer side of the chain is firmly against the chain ring and the untrustworthy local shop said it has to have a shorter bottom bracket..?

I have these wheels..http://www.merlincycles.com/bike-shop/wheels/road-wheels/factory-road-wheels/ultimate-hardware-700c-single-speed-wheels.html

Would it be possible to put a spacer in to move the cog about 3mm?.. or one guy said it might be possible to remove the smaller inner cog on the chain ring and replace it with the outer 48t that I use?

This is only a daily beater which is why I want a quick fix.. no quality parts will be harmed in this process.

Thanks

Fixed with vertical drop-outs requires either a 'magic gear' (google it) luck and religious devotion to chain cleaning and lubrication, or some other means of adjusting the distance between the centre of the cranks and the centre of the wheel: an eccentric hub or eccentric bottom bracket.

Sheldon had a neat bodge with cutting down a quick-release axle so that only the sewer projects into the dropout, buying a little more adjustment range.

A half link might get you close enough.

To get your magic gear to fit, changing the sprocket would probably be cheaper than changing the chainring (especially if it's part of your cranks).

A ghost cog/ring/sprocket could take up the slack to stop the chain coming off, but will still leave you with all the backlash - as you switch between accelerating and braking it moves up and down, letting the slack move between the top and bottom run of the chain.

You could find someone to replace your drop-outs with track ends. That would ultimately be the best solution as then you wouldn't be restricted to special components. (Unless yours is a high-end classic Peugeot, so that butchering it would make you a puppy-killer.)

http://www.flickr.com/photos/timwilson/179159561/

The Puppies are safe.. it isn't a high end Peugeot, the image above is pulled from the net but same model. I think originally the first bike shop said he had put a half link in so would I not be able to remove that? I don't know how that works...

The magic gear sounds pretty useful I might give it a go...

I was just hoping for a cheap(er) reliable commuter for uni to last me for a few months until I get something worth showing!

So I am in the middle of converting my 80's Peugeot frame into a fixed and sent it to a reputable bike shop to replace the chain, put on new wheels, tires ect. ...(easy enough to do yourself but for a fiver it saved me the trouble)...

For the first couple of weeks it was fine but now the chain is slightly too slack to stay on ... say when I get some speed or whilst pedalling off a curb. I had only gotten around 50 miles out of it and the chain is good quality.

I took it to a bike shop - This time I went to halfords. I also asked the guy to put some air in my tyres and he couldn't figure out what the valve extender was so I already had my doubts about him. Anyway he said the only way he could see of fixing the problem is a new crank set. Apparently there isn't enough slack in the chain to take any out of it and the wheel won't go back any further and the dropouts are not horizontal.

Can anyone suggest alternatives?

I really like what you've done here.

I'm in the middle of doing my own using the same model frame as yours but in red.

This thread makes me not want to get my bike shipped down to London! What's the best locking solution?

Saw this earlier too, not bad for halfords its just the halfords pricing that comes with it.

Despite how stupid.. I fear my front wheel coming off and getting a mouthful of concrete. I think its from seeing it happen once.. nasty.