Any question answered...

What is the benefit of Biopace chainrings?

None, that's why they stopped making them. Sheldon likes them but Chris at Highpath doesn't and the few pros still using oval rings, including Bradley Wiggins with his O-Symetrics and various Rotor Q users side with Highpath and pretty much every other oval ring maker in history. A cynic would say that Shimano only turned the axis throug 90deg so that they would have something patentable, since doing it the right way was already "prior art"

Spacing it doesn't affect the dishing, unless you also need to change the chainline.

Should i worry about loads of spacers on the axle and just cold set the frame?

Thanks mate....let me know if i can help out.....

Why does my 50's frame have a smaller than British BB threads?

The frame is badged as a Holdsworth.

Should i worry about loads of spacers on the axle and just cold set the frame?

Just use some spacers. It's not like you're going to be hucking big drop-offs where having a long unsupported axle might be an issue, and it's only 12mm each side anyway.

Cheers. x

What is the benefit of Biopace chainrings? My new road bike has Shimano ones. I can't feel any difference to regular rings but then again this is my first geared/freewheel bike, so I don't have much to compare to.

There supposed to lessen the effects of the dead spot when the cranks are vertical by increasing the leverage through their ovalness as brother as already said. Sheldon Brown puts there demise down to Shimano's poor advertising saying they increased pedalling efficiency at lower cadences leaving people thinking they would be worse at higher cadences when this was not the case. I had it on one of my bikes which I gave to my bro in law and found it fine.

Bloody good answer!

Wait, you were serious?

I thought it was a pisstake question. Like:

Why is the sky blue?

Rayleigh diffraction

Can God make a rock so heavy that even he can't lift it?

Why does my 50's frame have a smaller than British BB thread,
it seems less, cannot put British one, what size could it be instead?

Raleigh 26tpi? That is a finer thread than brit standard

Can God make a rock so heavy that even he can't lift it?

Yes; I can, and if God existed I would expect her to be at least as good at this stuff as I am.

Can God make a rock so heavy that even he can't lift it?

I did, I called it Everest.

^ I can top that.

A while back I made one I called 'Earth', by far my best work to date.

Could Jesus microwave a burrito so hot that he himself could not eat it?

Rayleigh diffraction

Not heard of this, did they use 531?

Could Jesus microwave a burrito so hot that he himself could not eat it?

Jesus isn't real, how can he eat burritos?!

Jesus isn't real, how can he eat burritos?!

Gah, you must have heard that one before..

^ I can top that.

A while back I made one I called 'Earth', by far my best work to date.

That's me told. :-)

anyone here like matisyahu?