Cold Set Frame 135 to 145

[bwgride]

I'm considering spreading rear stays of a steel frame from 135mm to
145mm to accommodate a tandem hub. Frankly, cold setting the rear of
the frame 10mm (5mm on either side) does not seem to me to be much of
an issue since it is only 1/4 of an inch on either side, but I would
like feedback from any with experience cold setting a frame by 10mm or
more.

What issues have arisen (or will likely arise) as a result of a 10mm+
spread? If I brace the bridges to prevent cracks while I spread the
frame, is there likely to be any problems that result?

Will I probably need to realign the dropouts so they are parallel, or
will going from 135mm to 145mm not likely change the angle of the
dropouts much?

 

[[email protected]]

Actually, in case it makes you feel any better about your project, 5mm
is .197" .

3/16" is .187"

Therefore, if you know that you will not be moving anywhere near 1/4"
but only 3/16", I think you will see that your project is VERY
'doable'.

And, yes, I have done this more than once.

Good luck with your project.

Lewis.

*****



bwgride wrote:
> I'm considering spreading rear stays of a steel frame from 135mm to
> 145mm to accommodate a tandem hub. Frankly, cold setting the rear of
> the frame 10mm (5mm on either side) does not seem to me to be much of
> an issue since it is only 1/4 of an inch on either side, but I would
> like feedback from any with experience cold setting a frame by 10mm or
> more.
>
> What issues have arisen (or will likely arise) as a result of a 10mm+
> spread? If I brace the bridges to prevent cracks while I spread the
> frame, is there likely to be any problems that result?
>
> Will I probably need to realign the dropouts so they are parallel, or
> will going from 135mm to 145mm not likely change the angle of the
> dropouts much?

 

[Jasper Janssen]

On 7 Jun 2006 23:25:14 -0700, "bwgride" <[email protected]> wrote:

>I'm considering spreading rear stays of a steel frame from 135mm to
>145mm to accommodate a tandem hub. Frankly, cold setting the rear of
>the frame 10mm (5mm on either side) does not seem to me to be much of
>an issue since it is only 1/4 of an inch on either side, but I would
>like feedback from any with experience cold setting a frame by 10mm or
>more.

I know my frame was cold set by that amount at the shop, to fit in the
tandem hub.

Jasper