What info to replace complete headset?

[curlie467]

What info do i need off the bike, i have been searching but there are a few available and specs mention all different measurements.
It is an orange gringo mtb, i am not sure of the year, internal diameter of head tube is 1 5/16", o/d of head tube is 40mm.
The headset that was in is a Ritchey scuzzy logic but only the outer parts were there, everything else was missing.
Can anyone shed any light?

[snotrag]

Its the steerer tube that you need to measure.

It will either be 1 inch diameter, threaded
1 and 1/8th inch diameter, threaded
1 and 1/8th inch diameter, non-threaded.

Purchase headset to match. Make sure you buy a cartridge bearing type unit.

[curlie467]

So i just need a 1 1/8" cartridge type headset and they will all fit my frame size?

[snotrag]

If its a 1 and 1/8th inch steerer tube you have, then yes thats what you need.

How old is the bike?

[curlie467]

Its early 00s think about 03.

[snotrag]

Makes sense. 1and8th inch threadless has been the most common size for 15years or so.

[curlie467]

Thanks very much for your help.