Tell us how it is done oh metalwork master.......:Knitting_22PFUP:

This pupil says (from memory - easier to do than to describe):-

1. Ensure all normal safety rules followed - clear work area, goggles, machines safety guards etc.

2. Select bit approximately 2/3 diameter of pin to be drilled.

3. Clamp chain in vice below drill stand with pin to be drilled below bit.

4. Use drill stand movements to centre drill bit over pin.

5. 'Square' or 'level' end of pin with metal file.

6. Use centre punch to locate bit when applied.

7. Drill to just below lower edge of upper pin link (to relieve pin).

8. Change bit to countersink bit.

9. Drill counter sink bit to just above top edge of upper pin link.

10. Support link on billet with core hole slightly larger than the lower pin head.

11. Use parallel punch to tap out pin.

This was before the days of angle grinders - but it worked.

A blunted knitting needle might have been the right size to insert in the appropriate place.

With apologies to Mr. Blount if he still lives for any errors/omissions in the above.

Can anyone tell me the difference between X ring and O ring?

An X ring chain has a seal ring between the side plates shaped like an X in cross sectoin.
An O ring chain has a seal ring between the side plates shaped like an O in cross section.

I think the idea of the X ring is it seals the same as an O ring chain but has less friction so more power goes to the back wheel.

Hope that helps.

Does anyone know how many links is standard on an XT chain i assume its universal?

Whats the difference in wear between alloy and steel sprockets? Is it just a difference in weight as opposed to any performance gains.

also anyone read this: http://www.quality-cycle.com/truth_a...cle_chains.htm

just read that last link on chains,,as i need one,, thanks that guy.... it has to be x ring now...