Steering Head Races, size of cups?

discussions specific to the 907IE
Post Reply
900streetfighter
Posts: 364
Joined: Wed Oct 27, 2010 5:52 pm
model: 907 I.E.
year: 1992
Location: Essex UK

Steering Head Races, size of cups?

Post by 900streetfighter »

Hello again,
In my quest to fit USD forks from a SSie Ive hit a snag. I've just got a monster bottom yoke,believing it to fit straight into the 907, but its bigger, SDF! The 907 stem is 25mm, the monster 26mm. No problem if the column is the same as SS, just run SSie bearings, or trawl bearing catalogues to find the correct size, but my 907 is in regular use so I'm unable to measure the taper cup o.s. diameter, anyone know what it is please. Cheers, Keith.
User avatar
ducbertus
paso grand pooh-bah
Posts: 531
Joined: Sun Jan 07, 2007 12:00 am
model: 907 I.E.
year: 1991
Location: holland

Re: Steering Head Races, size of cups?

Post by ducbertus »

that means your 907 stem is turned down from 26 to 25 to adapt a regular bearing. out side is 52 mm, which is also a standard size. 26 mm stems are a strange kind of protecting the market and are only obtainable by specialized stores.
goodluck Keith

Bertus
User avatar
paso750
paso grand pooh-bah
Posts: 5559
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Steering Head Races, size of cups?

Post by paso750 »

the original Paso steering bearing is:

Steering head bearing (2x)
id* 25mm od* 47mm width 15mm
SKF 32005-X/Q or
TIMKEN 32005X-90KA1 (inner bearing: XAA32005X, outer ring: YAA32005X) or
SNR 32005.V.C12
900streetfighter
Posts: 364
Joined: Wed Oct 27, 2010 5:52 pm
model: 907 I.E.
year: 1992
Location: Essex UK

Re: Steering Head Races, size of cups?

Post by 900streetfighter »

Thanks Guys.
User avatar
Janky59
Posts: 49
Joined: Sun Aug 28, 2022 6:56 pm
model: 907 I.E.
year: 1992
Location: Salisbury, MD USA

Re: Steering Head Races, size of cups?

Post by Janky59 »

During my winter maintenance I found the steering head bearings had a lot of notchiness when going thru lock to lock of the bars.
Previous forum posts have been a great help, and I thought I’d post up some current info on what I’ve learned so far.
1st up is the replacement o-ring for the groove in the collar referred to as the “Distance Piece” in the parts manual.
I bought a pack of 10 from US industrial supplier McMaster-Carr, PN 1295N253
The cost was about $7.00 + shipping.
0C835013-23E7-48E2-955D-2DEDA480B774.jpeg
0C835013-23E7-48E2-955D-2DEDA480B774.jpeg (129 KiB) Viewed 2533 times
Current moto stable:
‘21 Beta 390RS
‘18 BMW R1200RT
‘11 Ducati Hypermotard 1100 EVO
‘92 Ducati 907ie
User avatar
Janky59
Posts: 49
Joined: Sun Aug 28, 2022 6:56 pm
model: 907 I.E.
year: 1992
Location: Salisbury, MD USA

Re: Steering Head Races, size of cups?

Post by Janky59 »

I ordered the bearings and seals from the supplier Applied Industrial Technologies. It took about a week for them to come in.
The attached picture has all the info, I’ll say bearing prices have gone up a lot. I was a walk up customer and I don’t have any connections to get a discount. But if you need them, ya gotta pay, and I’m ok with paying for quality parts.
Attachments
2EFD9B18-7E2B-4760-8628-A04B0C3D8E3E.jpeg
2EFD9B18-7E2B-4760-8628-A04B0C3D8E3E.jpeg (236.2 KiB) Viewed 2519 times
Current moto stable:
‘21 Beta 390RS
‘18 BMW R1200RT
‘11 Ducati Hypermotard 1100 EVO
‘92 Ducati 907ie
Post Reply