BTW UK Members Only Anything read in this section is PRIVATE for BTWUK members only and must not be discussed with non members / AGM 2017 / next meeting at area 14
on: Today at 10:24:16 AM
|Started by monty - Last post by monty|
when is the next meeting of area 14 as I have just re joined and would like to come to the next meeting in area 14 Monty
on: January 17, 2017, 10:58:03 AM
|Started by maverik410 - Last post by Thunderace|
any advice on building a swing arm
My advice would be don't !
The thing to ask yourself is what exactly happens when one rear wheel hits a bump,
If the whole axle moves, that must mean the other wheel leaves the ground (bad)
If the whole axle does not move, that means the whole bike is deflected about it's longitudinal axis, which with four inches of trail at the front end will mean the steering is violently shaken (again bad).
Or if the one wheel station is to move without ether of the above then the swing arm has to flex, and that flexing will result in fatigue cracking.
I have had a number of 'swing arm conversions' come in the workshop,
and could not claim they were anything other than a very dodgy idea.
The Pan as stock has something like a 2.8 to 1 final drive,
so you would be better served by chopping down the rear end from a 328 or 323i BMW
mounting up the diff solid,
and using some 1 1/4 or even 1 1/2 thick walled tube to form two semi-trailing arms
to carry the rear wheel hubs.
plus I would recommend reducing the trail at the front end by at least two inches,
which will bring the steering effort down to something manageable.
Generally I could not recommend attaching an archaic beam axle to any kind of swingarm type thing, the small amount of extra work involved in making a simple IRS is more than out weighed by the better result obtained.
on: January 16, 2017, 09:58:16 PM
|Started by maverik410 - Last post by maverik410|
Hi guys i am looking at doing a conversion on my bike st1100
so any advice on building a swing arm or plans if you have any
i am thinking of 1" tube With 3mm wall thickness
for ideas as to how deal with the way the swing arm bolts on