Widest 18” rim and tire on Atlas swing arm?

mark99 · Oct 18, 2023

If this has been discussed before, please point me to it

With an Atlas swing arm, If I use an 18 wheel, what is the widest wheel and tire that I can use?

I have seen someone mention ‘scalloping’ the swing arm

I imagine that means cutting the arms off, angling them a little more and then cutting and kinking the arms, but I don’t know

Anyone know about this?

Thanks

74ok · Oct 18, 2023

Tire width on Featherbed Swingarm?

Guys, What tire size is the maximum size that one could fit in a slimline featherbed swingarm? I have a 4.00 x 18 Avon Roadrider on mine and I've only got about 1/16 of an inch clearance on each side.

www.accessnorton.com

mdt-son · Oct 20, 2023

mark99 said:
I have seen someone mention ‘scalloping’ the swing arm

I imagine that means cutting the arms off, angling them a little more and then cutting and kinking the arms, but I don’t know

Unless you are building a track bike, your plan is extremely hazardeous. As are most chassis parts, the swinging arm is a critical load-carrying member which has undergone extensive testing, inspection and heat treatment at the factory.
If you value your life and that of others, you should not think about messing with this part. If an accident happens which can be attributed to your tampering, you will loose insurance cover, and counterparts could sue you for negligent damage.
Would you risk altering the trailing arms of your car? I hope not. Leave it be.

- Knut

74ok · Oct 20, 2023

Wider swinging arm for Slimline Featherbed

Hi All, I'm looking for a wider (at least 15 millimeters) than standard swinging arm allowing me to use e.g. a 400 x 18 Bridgestone Battlax BT45 rear tyre. Of course the swinging arm pivot must be the same length as the standard one. Have you ever heard of a supplier of that sort of thing...

www.accessnorton.com

point arrow/cursor on screen/pg88 then use slider size increase (bottom right) to read

Café Racer Magazine | Issue 75

Read Café Racer Magazine | Issue 75 by Café Racer Magazine on Issuu and browse thousands of other publications on our platform. Start here!

issuu.com

partial article here

Fat Featherbed Designing Swingarms Explained - Issuu

A choice of two lower shock mounts means riders can swap positions to speed-up the motorcycle’s steering.

issuu.com

mark99 · Oct 20, 2023

mdt-son said:
Unless you are building a track bike, your plan is extremely hazardeous. As are most chassis parts, the swinging arm is a critical load-carrying member which has undergone extensive testing, inspection and heat treatment at the factory.
If you value your life and that of others, you should not think about messing with this part. If an accident happens which can be attributed to your tampering, you will loose insurance cover, and counterparts could sue you for negligent damage.
Would you risk altering the trailing arms of your car? I hope not. Leave it be.

- Knut

Did say it was my plan, saw it some where

mark99 · Oct 20, 2023

74ok said:
Wider swinging arm for Slimline Featherbed

Hi All, I'm looking for a wider (at least 15 millimeters) than standard swinging arm allowing me to use e.g. a 400 x 18 Bridgestone Battlax BT45 rear tyre. Of course the swinging arm pivot must be the same length as the standard one. Have you ever heard of a supplier of that sort of thing...

www.accessnorton.com

point arrow/cursor on screen/pg88 then use slider size increase (bottom right) to read

Café Racer Magazine | Issue 75

Read Café Racer Magazine | Issue 75 by Café Racer Magazine on Issuu and browse thousands of other publications on our platform. Start here!

issuu.com

partial article here

Fat Featherbed Designing Swingarms Explained - Issuu

A choice of two lower shock mounts means riders can swap positions to speed-up the motorcycle’s steering.

issuu.com

thanks, I don't think they do Norton stuff any more, I will try them again