Help me identify my headset

MassiveJim · 1 Jun 2019 at 20:33

I need to replace my headset, but I am getting a bit lost with the amount of options and don't want to order the wrong parts.

I have this bike
https://www.evanscycles.com/scott-genius-750-2016-mountain-bike-EV253375

Cane creek headset finder tells me that I need
Upper
ZS 44 / 28.6
Lower
ZS 55 / 40

pictures of headset
https://imgur.com/gallery/X5bZNzj

i assume cane creek is telling me sizes in metric but looking on most sites headsets are listed in imperial.
Do I need a semi-integrated tapered ?

Jonny ///M · 1 Jun 2019 at 23:36

Pretty much semi integrated tapered zs is zero stack.

55 isn't as common as a 56mm cup but they do exist.

https://www.tredz.co.uk/.RSP-ZS44-28-6-1-1-8-Zero-Stack-Top-Cup_100865.htm

https://www.tredz.co.uk/.RSP-ZS55-40-1-5-Zero-Stack-Bottom-Cup_100857.htm

You will need to knock out the cups and replace the crown race that's on the fork at the moment.

You can replace the cartridges in the future on the RSP one too.

MassiveJim · 2 Jun 2019 at 01:35

I spent 3 hours after i posted this on various sites trying to work it all out.
And the 2 links you have posted are exactly what I have ordered, same supplier too.

I know my way around a bike to change the headset etc, I just haven't kept up with the latest lingo and standards.
I was really into MTB'ing around the mid 90s, and there weren't so many different types of headset then, pretty much threaded or non-threaded in 2 sizes

Jonny ///M · 2 Jun 2019 at 01:50

Aye it's a *********** now with headsets, BBs and less so now but wheel axles/spacing.

There are two semi integrated 1.5" standards....with a 1mm difference in the cup......why?????

Integrated headsets - IS41/42 (1 1/8") 47(1 1/4"), 49(1 3/8") , 52, 51ish(1 1/2") then Giant do bigger steerers with a frame that uses IS42 and 47 but with a bigger inner race to suit a 1 1/4" steerer.

I moan a lot but back int day you had to buy a new caliper half for a Hope C2 if you wanted a bigger rotor or moved from IS mount. Then you had all those bloody washers to space out IS brakes until post mount took over. Octalink/ISIS BB was a thing but was it really any worse than press fit bearings that last a few months and potentially wear carbon frames out over time?