Headsets and standards

[Lazarus]

I miss 1/18 and everything being the same

Short version I need to fit some 1 1/8 forks to an integrated - 52 mm internal headest Kinesis- all new to me in building terms.
Kinesis recommend a bearing that is 35/45 for angles [dont do one for 1/1/8] but only hope seem to do an adapter for 1 1/8 forks and this uses a 45/45 angled bearing - will this really matter or will it work just fine ?
so will this angular difference really matter?
I am prefering hope as I have the top part its only the bottom part that is required and dont want to buy a whole headet but will if I have to

Thanks.

[jameso]

That's a faff, 45 angle bearing seats are more common. The angle does matter as the shelf angle in the headtube that needs to match up with the bearing race angle.

Kinesis recommend a bearing that is 35/45 for angles

- a lower bearing with 45 seat angle but a 35 degree crown race angle (usually 36 degrees for crown race tho), or 35 degree upper / 45 degree lower race angles (or V-V)?

As long as head tube and bearing seat angles match up the crown race and lower bearing will be part of the same kit that you can get from Hope.

[Lazarus]

Not sure hence asking
The top one is a 45/45 - does this suggest its just the crown race that is different as i cannot see why the top cup and bottom are different angles


the bearing for the headest they recommend is
1.1/2” Lower Bearing 36/45, 51.8 OD, 40 ID.
But no adapters for 1 1/8 forks
Hope is the same size but a 45/45 as to which side goes where Sorry I dont have a clue

No one seems to know for sure I guess even you folk cannot keep up with standards so what hope is there for us little people.

[jameso]

1.1/2” Lower Bearing 36/45, 51.8 OD, 40 ID.

Ok so that's a 45 bearing seat in the frame (normal) and a 36 degree crown race angle. It's the same spec lower bearing as an Arkose, an FSA Orbit C40 ACB, common size. It's the NO.42/48/ACB on this page, https://www.fullspeedahead.com/en/suppo ... tegory=139
pdf 2D drawing on the link (FFS, FSA call it the C40 but aka no42.. drives me nuts too )

From Hope you'll be getting a bearing with a 45 degree frame-side and a 45 degree crown race side, and I assume the reducer crown race comes with it. The 36 degree bit of the old lower bearing and crown race doesn't matter. All good

[Lazarus]

Cheers i very much appreciate your help and I shall get the Hope one - i was assuming you were the one with the knowledge so cheets for your time,expertise and help.
Its a seperate part to enable the standard crown race @ 1 .5 to fit the fork - so handy when the fork gets upgraded
probably adds a few mm to [effective] A- C

[jameso]

Cheers i very much appreciate your help and I shall get the Hope one - i was assuming you were the one with the knowledge so cheets for your time,expertise and help.
Its a seperate part to enable the standard crown race @ 1 .5 to fit the fork - so handy when the fork gets upgraded
probably adds a few mm to [effective] A- C

No problem, I have the cheat sheets here (FSA and Shimano diagram books etc)