ID of Reynolds 753 frame

[531brazed]

It appears to have been fillet brazed, this is a no-no for 753 which needed to be built using lower temp silver solder. So either its been cooked or its not 753. What does it weigh ?

update
dave yates and possibly others did fillet braze 753, naughty

 

[dwscrimshaw]

With the paint off and totally striped frame it is down at 1.656Kg, 0.603Kg for the forks. I have been looking at Columbus tubing and there is one set down at this weight with ribs in steerer only that is recommended for TT frames and therefore I assume Lo-Pro. This is the EL set. Only thing is the seat tube is down at 0.7mm on mine and the EL tube is 0.8mm

It also has triangular section seat stays which has puzzled me for a while, not seen many frames like this, but it is difficult to get pictures of them. They are 16x11mm in the middle of the stay going round at the bottom.

Any thoughts

 

[dwscrimshaw]

Looks like KL tubing, similar weight, but 0.7 my seat tube.

 

[originalshinkicker]

It appears to have been fillet brazed, this is a no-no for 753 which needed to be built using lower temp silver solder. So either its been cooked or its not 753. What does it weigh ?

update
dave yates and possibly others did fillet braze 753, naughty

I don't think that is actually true.

 

[Midlife]

My Moser is silver brazed lugless . So I guess you could silver fillet braze 753?

Shaun

 

[dwscrimshaw]

Yes, I think I have seen some pictures of this too. I guess it is unsual, but not recomended.

I think my frame is actualy Columbus as I have now found a frame number on the Columbus steerer that matches the only marking I can see on the frame, 0118. The seat stays still puzzel me, did either Reynolds or Columbus use triangular section stays?

The seat tube wall thickness is 0.7mm at the open end which matches 753 or Columbus KL tubing. Is it likly to mix and match tubing types?

Any thoughts?

 

[dwscrimshaw]

Thanks, yes I have not tried the BB end, but as the top of the seat tube is lugless and open I have measured this. It is coming up at 0.7mm wall thickness that I believe is consistent with ether 753 or Columbus KL tubing.

My forks are clearly Columbus and have a number, 0118, that matches the only marking I can see on the frame. this is actually obscured by the braze on cable guide, but the first and last digit match and it look like 11 in the middle.

I am assuming it unlikely that tubing would be mixed, but in theory possible, so assume this is actually incorrectly badged with re-con sticker. The seat stays still puzzle me. Would you know if triangular section stays would be used by either company?

 

[originalshinkicker]

In all honesty, I think you may struggle to find out what tubing it is unless you can strip it and find some kind of manufacturer marking on the frame. I think both Reynolds and Columbus are good at these markings.

It's not "not recommended" to fillet braze 753, it is just unusual, but possible - different silver solders have different melting points. a normal temp silver used first to make the joint then a lower temp and thicker silver to make the fillet.

Be careful measuring tubes. 0.7 was used across several Reynolds tube sets, not just 753. 531 Pro also has a 0.7 variety and so does 531c, it just depends what gauge was used and if it is metric or imperial tubing.

Several builders mix and match tubing. It is more common now, not so common BITD but still done. A true custom frame will spec a certain type of tube for each part of the frame depending on what was required from it for strength, stiffness or flex.

 

[dwscrimshaw]

Thanks, I'll kep digging. Any thoughts/comments on the triangular seat stay section, are these common to any particular tubing?

 

[dwscrimshaw]

This turned out to be a Columbus frame and is now built up into a bike for sprinting around on. Been out couple of times and it goes well. Perhaps should mix Shimano with this frame, but already had the parts when I found out what it was.