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Re: High or Low frame

Tony betts
Peter,
Also don't forget, the difference in hight between 19 x 3.50 tyres and 17 x 4.00 tyres bringing the caster back 1 inch

Tony.

Location: Piddle Valley

Re: High or Low frame

I've never noticed if there is a difference in camber in the nose piece.

There are different heights of front springs, that would even things out. After wheel sizes.

I mension the nose piece as different, as IAN says the cow horn holes are in different positions.

I look at the nose as being 2 different items.because of the ebay users, there is usually a difference in valued price. Early ones always being more expensive, for those wanting to built a vintage chassis. Ulster etc.

But on ebay many will fall for paying to much for the latter Ruby type, thinking they have the same thing as an earlier nose.

There are other small difference for fitting gearbox, body etc. But thought just the main differences would sort this question.

Tony.

Location: Huncote on the pig

Re: High or Low frame

Thanks Ian.

Of all my alleged many errors the first anyone has troubled to explain.
I compared the brackets years ago and noticed a difference but obviously not in the stepdown.
A consolation, unlike many of the errors in books and Club publications, unlikely to have inconvenienced anyone.

Location: Auckland, NZ

Re: High or Low frame

The measured difference between the two types is just over 1 degree, I have just double checked two vintage 1926 and 1929 chassis, against two post vintage 1936 and 1938 chassis, the variance is reasonably consistent when measured with an engineers protractor.


And Bob my issue with you is that you make statements such as there is a difference in set dow when you don't actually know. It is extremely misleading to the less well informed, why not simply say that you wonder if the set down was altered and ask the question. That way you would not mislead others or **** off those of us who do know what we are talking about, by now most simply can not be bothered with you any more.

Location: NZ

Re: High or Low frame

So as a summary the term "low frame" has nothing to do with the section of the frame. It is instead that the chassis sits lower, this is achieved by less camber in the rear springs with a small change to the front nose piece to compensate for the caster change that the rear lowering would cause.

So apart from the nose piece the frames are practically the same.

It is a pity that Bob's explanation was not correct as it seemed to have more going for it.

Cheers

Mark
from wet and cold Aus

Location: Rokeby, Victoria, Australia

Re: High or Low frame

The front crossmember is certainly diferent. The low frame version has a dip in the middle where the ball is for the radius rods to the axle. No doubt to cater for the different 'angle of dangle' of the front axle as noted by ians measurement of the nose piece.

Location: not north wales any more

Re: High or Low frame

There are lot's of subtle and a few not so subtle differences, as Henry said above very little is identical to what came before.

Location: NZ

Re: High or Low frame

From the A7CA Archive, Spare Parts List 1218A shows both high and low frame chassis in detail on pages 55, 56,57 and 58.

As with most Spares lists there are a few oddities but in general this shows the differences (it doesn't note the different nosepiece angles)

The cards may give more information.

http://archive.a7ca.org/wp-content/uploads/PL_1218A.pdf

Cheers, Tony.

Location: Melbourne, Victoria, Australia.

Re: High or Low frame

So under the heading Low Frame you have Front Spring Bracket BR155, under heading Low and High Frame you have Front Spring Bracket BR47 with no Front Spring Bracket list individually for the low frame. I suppose this could be a typo?

The plot thickens.



Location: Rokeby, Victoria, Australia

Re: High or Low frame

Hi Mark,

"As with most Spares lists there are a few oddities"

From earlier Spares Lists for the then standard chassis which later became designated the 'high frame', BR 47 is the correct original front bracket.

Cheers, Tony.

Location: Melbourne, Victoria, Australia.