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General Category => General Discussion => Topic started by: Simon_London on December 17, 2018, 03:17:31 PM

Title: Tonti swinging arm bearings different sizes - what bike?
Post by: Simon_London on December 17, 2018, 03:17:31 PM

I bought a spare Tonti swinging arm. Having fitted the UJ carrier bearing and one new swinging arm bearing I realised that the other swinging arm bearing is a different size. A few ml bigger in diameter than the other side. Weird.

Any one know what bike this came off?

Simon

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: guzzisteve on December 17, 2018, 03:39:31 PM

They all have same bearing on each side, you got stiffed. Have to be careful these days.

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Antietam Classic Cycle on December 17, 2018, 03:46:39 PM

I don't know of any (early) Tonti that has a different bearing on one side. What could be missing on the larger i.d. side is the flanged "insert" or bearing seat that fits into the swingarm and sometimes comes out when the bearing outer race is removed. It's not shown as a separate part on any diagram I can find.

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Simon_London on December 17, 2018, 07:14:02 PM

Hi Antietam

I think that must be what has happened.

Thanks

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Antietam Classic Cycle on December 17, 2018, 08:29:21 PM

Quote from: Simon_London on December 17, 2018, 07:14:02 PM

Hi Antietam

I think that must be what has happened.

Thanks

If you need a photo, I can shoot a few for you.

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Rolf Halvorsen on December 18, 2018, 04:50:30 AM

The early 1972 models had UNI-joint Ø30 on one side and Ø28 on the other side entering the bearing.

The later (from 1974) had UNI-joints Ø30,2mm on one side and Ø30,0 on the side entering the bearing (6206 if I remember correct).

I hope this is a help for someone.

'Rolf

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Antietam Classic Cycle on December 18, 2018, 09:06:55 AM

Quote from: Rolf Halvorsen on December 18, 2018, 04:50:30 AM

The early 1972 models had UNI-joint Ø30 on one side and Ø28 on the other side entering the bearing.

The later (from 1974) had UNI-joints Ø30,2mm on one side and Ø30,0 on the side entering the bearing (6206 if I remember correct).

I hope this is a help for someone.

'Rolf

It's not the u-joint carrier bearing he's asking about, but the swingarm pivot bearings. 

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Simon_London on December 21, 2018, 03:52:25 AM

The missing piece ! The vendor found it and sent it to me.




(https://i.ibb.co/fq4hph6/20181221-094237.jpg) (https://ibb.co/fq4hph6)

what rhymes with austin (https://babynamesetc.com/rhyming)

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: earemike on December 21, 2018, 05:02:41 AM

Quote from: Rolf Halvorsen on December 18, 2018, 04:50:30 AM

The early 1972 models had UNI-joint Ø30 on one side and Ø28 on the other side entering the bearing.

The later (from 1974) had UNI-joints Ø30,2mm on one side and Ø30,0 on the side entering the bearing (6206 if I remember correct).

I hope this is a help for someone.

'Rolf

Thanks Rolf,

I’d forgotten my 750 had a different uni - you keep me honest!

Title: Re: Tonti swinging arm bearings different sizes - what bike?
Post by: Antietam Classic Cycle on December 21, 2018, 08:53:06 PM

Quote from: Simon_London on December 21, 2018, 03:52:25 AM

The missing piece ! The vendor found it and sent it to me.




(https://i.ibb.co/fq4hph6/20181221-094237.jpg) (https://ibb.co/fq4hph6)

what rhymes with austin (https://babynamesetc.com/rhyming)

That's the one!  :thumb: