1969 commando Roadster steering yoke bearings

illf8ed said:

Here are the original steering bearings from my March ‘69 750 S.
I did as a Dave mentioned, put later Commando ball bearings with modified tube spacer. I can always go back to the original if needed.
View attachment 18444

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I can't quite read the numbers. Looks like (R&M) 23 or 25 LJT25.

R&M LJT seems to be an angular thrust bearing.

Outer is 29LJT25 R&M THRUST ENGLAND 97
Inner is 25L R&M 97
5/16”ball bearings

Assembled looks like this.

illf8ed said:

Outer is 29LJT25 R&M THRUST ENGLAND 97
Inner is 25L R&M 97
5/16”ball bearings

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Thanks. I saw the 'THRUST' marking.
I'd forgotten DogT mentioned the R&M 29LJT25 in 2010.

Maybe available?
Wonder on the price?
Wonder if 29LJT25 are better than the conventional cup and cone/ball, which seem very pricy and most that I have opened up have dimpled/dented races...which may be a symptom of improper preloading?

dynodave said:

Wonder on the price?
Wonder if 29LJT25 are better than the conventional cup and cone/ball, which seem very pricy and most that I have opened up have dimpled/dented races...which may be a symptom of improper preloading?

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Wonder if these loose ball bearings have been superseded by 7205, modern Single Row Angular Contact Ball Bearings where the balls are caged and the bearing is in one piece. In which case they can be found in 2RS configuration with 2 rubber seals.

Not sure if the original loose bearings I posted are still available. The ones Andover is selling for early Commando are cup and cone type which are different. I’m using Commando bearings and put the originals in a zip lock bag.

illf8ed said:

Not sure if the original loose bearings I posted are still available.

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loose ball? 29LJT25
It says available in my post above at the link above


SKF sez...

6205:
CALCULATION DATA
Basic dynamic load rating C 14.8 kN
Basic static load rating C 07.8 kN
Fatigue load limit Pu0.335 kN
Reference speed28000 r/minLimiting speed14000 r/min
Calculation factor kr0.025
Calculation factor f014

7205:
CALCULATION DATA
Basic dynamic load rating C14.8 kN
Basic static load rating C09.3 kN
Fatigue load limit Pu0.4 kN
Reference speed16000 r/minLimiting speed15000 r/min
Calculation factorA0.00159
Calculation factor kr0.095
Calculation factor e1.1

7205 do seem to be pricier.

I knew I had something to say about this a long time ago, but Les remembered for me since I can't.

L.A.B. said:

Thanks. I saw the 'THRUST' marking.
I'd forgotten DogT mentioned the R&M 29LJT25 in 2010.

69 "S" Phoenix rises again

Another note from the old geezer. I found out lately, last couple of days, that the bearings in my steering head are different than most I see on the forum. I have R&M 29LJT25 bearings which I find out are angular contact bearings. They will carry a load in both radial and axial directions...

www.accessnorton.com

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