Swing arm clearance to frame

[vanzen]

GSPD is up to tricks and apparently still busy with the current SO.
Today's mail included this pic:



FH, now as "supershaft", but certainly still true to his inimitable form,
can often be found terrorizing ADV olds cool or on facebook –

[Roy Gavin]

FH IS is trying his best to behave himself over on ADV old school, it is just that he isn't very good at it.

But he has learned to walk away, which is a start.

[Garnet]

Back to...ah... swing arms....When wheel spacers are put in to accomodate wider tires, has anyone tried to set the swing arm off center? Seems like old style (non-cush) shafts would work better for this.

That is a common practice when building a /2 conversion. The swing arm has to be offset to centre the drive shaft in the tube. I overcame that by mounting my /5 engine slightly cock-eyed in the frame which put the swing arm back in the centre of the frame.

Not that this helps our buddy from South Africa.

[mattcfish]

Back to...ah... swing arms....When wheel spacers are put in to accomodate wider tires, has anyone tried to set the swing arm off center? Seems like old style (non-cush) shafts would work better for this.

That is a common practice when building a /2 conversion. The swing arm has to be offset to centre the drive shaft in the tube. I overcame that by mounting my /5 engine slightly cock-eyed in the frame which put the swing arm back in the centre of the frame.

Not that this helps our buddy from South Africa.

Thanks for that bit of knowledge Garnet. I amagine a big tube swingarm with an old style shaft is the best combo for this.

Vanzen, Thanks for the FH, GSPD update. I'll stop being the Devil's advocate (or is that advocating the Devil) now.

[vanzen]

....When wheel spacers are put in to accomodate wider tires, has anyone tried to set the swing arm off center? Seems like old style (non-cush) shafts would work better for this.

I have used wheel spacers and off-center SA spacing w/ wider tires to maintain stock spec track offset.
The method worked well.
Drive-shaft clearance / interference in the SA tube remains the critical limiting factor.

I have found that, given a desire for minimal or stock prescribed track offset,
the later (big tube) SA intended for cush drive will limit increased tire width, not the drive-shaft within.
Such that, unless this SA tube is modified or track offset is increased,
fitting a non-cush drive-shaft into a cush-intended SA would gain nothing in terms of tire clearance
and little in terms of the potential to reduce track offset.
This will be the advantage of using an early (small tube) braced SA vs the later SA
if wider tires and minimum offset are planned.

To return to the original question, if I rode a Type-247 with stock size tires,
I would be inclined to reduce the stock track offset
by biasing the SA as much as would be possible to the right of center.