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Hopefully that image will clarify issues.

The chainring/crank arm is right up against the frame i.e. there's no space at all between the outer edge of the bottom bracket and the chainring/crank arm.

Now, the spider rubs against the frame. Hopefully you now see the problem.

BB is not the issue - the crankarm is flush against the frame.

Currently my chainline is off and I need to get the chainring as close as possible to the frame.

Hi, when I put the chainring on my BB, the inside part of the spider touches the frame.

Do I have to find a spider that connects the chainring from the 'outside'.

Would this not be a problem with a singlespeed chainset?

In other words, can I get away with purchasing a cheap road crankset from somewhere or do I have to get a proper singlespeed? Thx.

Hi, just saw this on ebay. Anyone have any experience of it? Would it be OK to put on a conversion I'm doing. Ta.http://cgi.ebay.co.uk/46-tooth-alloy-singlering-chainset-crank-for-bike-cycle_W0QQitemZ270419466776QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item3ef6419a18

Plastic, good point. I'd have thought the chainring can be replaced...surely?

I happened to have an old Shimano BB (JIS taper)...unfortunately the cranks and chainset I had won't fit on my BB. So, more than likely, I'll have to shell out £40 or so for a new chainset...unless I can find something cheap on here...

LMAO - I just been going through all this over the last few weeks.

You'll have to do your research on Sheldon Brown.

If you want a fixed gear, get a BB with width 107mm or 110 thereabouts. Also ensure you sort out the tapering question http://www.sheldonbrown.com/bbtaper.html - this is important because otherwise your chainline will be messed up.

Good luck.

Hi, just wondered if anyone can recommend a singlespeed/track chainset.

Velosolo has the Lasco Track and Singlespeed Chainset, which looks OK, but I'm really looking for something cheaper.

In the past I've converted road chainsets but, whilst cheaper, this can prove a lot more hassle in the long run...chainline issues!

The cranks are a pair of old Raleigh cranks (ISO probably according to S.B.) and so if I get some JIS ones that should give me the extra mm I need.

Hi, further to my post below I got a new BB (110mm instead of 127mm) and so the chainring/crank is much closer to the frame now. However, I'm uncertain as to how much room I have to put spacers on the rear hub. I only need about 3mm probably but the threads on the Ambrosio hubs are not very wide and I don't know if there'll be space for spacers.

If anyone has any advice on this, it'd be appreciated. Thx.

I got a couple of cycling guides for New Zealand if you're interested. Cycle touring mecca of the world btw.

The cranks are old Raleigh ones and so according to S.B. they are ISO.

So, after all that, if I just buy a 107mm BB, that'll solve my problem right?

The BB is a Shimano Bottom Bracket Square Taper UN54 (J.I.S. spindle?)

Yes, according to Sheldon Brown, "ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length"

Yes, same crankset.

I had a fixed rear wheel on a previous frame. I purchased a new frame and wanted to use the same set of wheels (+cog) from the old frame. In order to ensure that there'd be no issues with chain alignment, I checked the width of the BB on the old frame and purchased a new one with the same width...the old BB measured 68-127mm.

Now, having put together all the parts on to the new bike, the chainline is well out:
I'm a bit confused as to why this is. I think maybe it has something to do with the tapering on the BB perhaps...meaning the chainring won't go closer to the frame???

I'm also concerned about whether it will at all be possible to get chain alignment with this frame. The chainring on there at the moment is a 48T. If anyone can suggest anything that'd be appreciated.

Odd, it seems I was screwing the wrong way...started turning anticlockwise and it went straight in.

This is the frame I'm trying to fit the bb to: http://www.lfgss.com/thread34309.html

I was told that it is British 68mm.

Hi,

I'm currently trying to fit this BB:

It's the 68-127mm size. The fitting is correct but for some reason it won't thread on. I'm worried that by forcing it too much it might damage either the frame's bb thread or the bb itself. Any ideas? Thx.

OK, if no one wants this, off to ebay it is.

Headset is OK. BB needs a service I reckon.

I rode it for a few weeks but got myself a larger frame.

Roll up! Roll up! Don't let this beauty get away!

Would be a perfect size for someone about 5ft 10" - 178cm. I'm 6ft - it's a little too small.

Includes a new 1" seat tube as pictured.

Offers, or if no one's interested, it'll be ebay.

Raleigh Grand Prix (old school frame from 70s)

Size 60cm seat tube / 56 cm top tube - would fit someone 5ft 10 (178cm).

Rear drop out width 120mm.

£70 - collect from NW11 - near Highgate.