I lengthened mine by 1.5" and it still turns great. I used to feel it wheelied too easily up steel hills and it seems to grip better with the longer arm. Used a scarf cut for strength and inserted a tube for strength - used for 2 years and lots of drop offs/rocky sections and no problems.

Stu

Whats a scarf cut ?

Whats a scarf cut ?

Very common carpentry term, wood joinery. Google it.

Just a cut at an angle, diagonal to the length of the tube (if that makes sense?) - the weakest point will likely be either side of the weld but by cutting it diagonaly the weld is spread along a longer part of the swingarm and therefore the force on the weld is spread.

like this

http://www.flickr.com/photos/76022002@N08/8586722762/in/photostream

Hi I am just starting to build a bsa bantam trials and I need to extend the swinging arm please could you tell me the diameters of the bushes as I dont have the wider swinging arm yet but I need to make the bushes at college befor I leave college

Matt

Matt, I have some in the garage so I will measure them later for you. They are only £8 on ebay though - are you sure you want to go to the trouble of making some?

Very common carpentry term, wood joinery. Google it.

Sorry, thought it was a bit like a paper cut !

Hi I didnt mean the brass bushes it was the ones to extend

Matt

Sorry, can’t remember what size I made the bushes .. I have an old swing arm somewhere I will try and measure it up over the weekend

Cheers

Matt

Matt,

just measure the ID of the swingarm tube when you've cut it, should work?

The OD is 28.72mm

The ID is 23.5 to 23.79mm (slightly oval) I would guess the original tube ID was 15/16”??

It also has a ridge of braze where the tube is seem-welded

Hope this helps

thank you