Reynolds 631

General cycling advice ( NOT technical ! )
Ke1th
Posts: 57
Joined: 11 Jul 2018, 7:54pm

Reynolds 631

Postby Ke1th » 2 Feb 2020, 11:19am

Hi,is it unusual for a Reynolds 631 frame to be built using lugs?

mercalia
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Re: Reynolds 631

Postby mercalia » 2 Feb 2020, 12:47pm

Ke1th wrote:Hi,is it unusual for a Reynolds 631 frame to be built using lugs?


My Dawes 1-Down is welded I think the difference between 531 and 631 is that 631 is surface hardened giving a bit more strength. 10%?

Do you have a bike in mind?

AndyA
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Location: Edinburgh

Re: Reynolds 631

Postby AndyA » 2 Feb 2020, 12:58pm

No, loads of lugged frames made in 631. 631 can be welded or brazed no problem. I suppose it is slightly unusual in that 631 came out after the heyday of lugged frames, and that the majority of 631 frames are welded.

Ke1th
Posts: 57
Joined: 11 Jul 2018, 7:54pm

Re: Reynolds 631

Postby Ke1th » 2 Feb 2020, 2:23pm

Thanks for replies. I have seen a bike local to me, thought it would be more likely to be welded but this one is lugged.

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geomannie
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Re: Reynolds 631

Postby geomannie » 2 Feb 2020, 2:56pm

Ke1th wrote:Thanks for replies. I have seen a bike local to me, thought it would be more likely to be welded but this one is lugged.


My Dave Yates 631 frame is lugged and very nice it is too. I was offered the option of lugged or brazed.

Cheers
geomannie

PH
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Re: Reynolds 631

Postby PH » 2 Feb 2020, 3:39pm

Lots of Mercians are 631 and lugged.
Because it's easily weldable, I think a lugged 631 frame is more likely to have been built by a small scale traditional builder than a high volume one (Though there are probably exceptions) Previous steels which weren't so easily welded were more likely to have been lugged by all builders, so lugs themselves are not an indication of quality. Likewise, although a craft builder is less likely to weld a frame, there's nothing wrong with those that are - I hope not anyway, my three steel frames are all welded, 631,725, 853.

botty
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Joined: 31 Dec 2014, 8:24pm

Re: Reynolds 631

Postby botty » 2 Feb 2020, 5:18pm

I've just taken delivery of a lugged 631 Mercian.

mercalia
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Re: Reynolds 631

Postby mercalia » 2 Feb 2020, 6:26pm

https://www.reynoldstechnology.biz/materials/steel/s-631/

though it says

Utilising the same chemistry as 853, Reynolds 631 is cold-worked and also has the advantages of air-hardening after welding.


so does that mean welding is best?

pwa
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Re: Reynolds 631

Postby pwa » 3 Feb 2020, 5:29am

mercalia wrote:https://www.reynoldstechnology.biz/materials/steel/s-631/

though it says

Utilising the same chemistry as 853, Reynolds 631 is cold-worked and also has the advantages of air-hardening after welding.


so does that mean welding is best?

Presumably a well chosen lug is supportive and makes a strong join, so not much to worry about there. The air hardening is just another approach to making a strong join zone. What you wouldn't want to do is weld a tube intended only for lug joins. Lugged 631 has been around for quite a while now with no issues.

LollyKat
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Re: Reynolds 631

Postby LollyKat » 3 Feb 2020, 10:26am

Can you replace a damaged tube on a 631 frame, either welded or lugged? The downtube of my son's 531 Mercian was badly mangled after someone tried to lever open the D lock, but after Mercian replaced it and resprayed the frame it was as good as new.

mercalia
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Re: Reynolds 631

Postby mercalia » 3 Feb 2020, 10:30am

LollyKat wrote:Can you replace a damaged tube on a 631 frame, either welded or lugged? The downtube of my son's 531 Mercian was badly mangled after someone tried to lever open the D lock, but after Mercian replaced it and resprayed the frame it was as good as new.

How much did it cost?

Some thing similar happened to my Dawes Horizon, but with a trolly at Sainsburys. I decided the cost was too high

PH
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Re: Reynolds 631

Postby PH » 3 Feb 2020, 4:18pm

LollyKat wrote:Can you replace a damaged tube on a 631 frame, either welded or lugged?

Lugged yes, it’s no different from doing it on any other lugged frame. Welded, probably not, though you’ll probably get a replacement welded frame for the repair price anyway.

David9694
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Re: Reynolds 631

Postby David9694 » 3 Feb 2020, 10:14pm

When you say welded, do you mean fillet brazed?

LollyKat
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Re: Reynolds 631

Postby LollyKat » 3 Feb 2020, 10:35pm

mercalia wrote:
LollyKat wrote:Can you replace a damaged tube on a 631 frame, either welded or lugged? The downtube of my son's 531 Mercian was badly mangled after someone tried to lever open the D lock, but after Mercian replaced it and resprayed the frame it was as good as new.

How much did it cost?

Some thing similar happened to my Dawes Horizon, but with a trolly at Sainsburys. I decided the cost was too high


It was nearly 20 years ago and I don't remember how much it was - not cheap but a fair bit less than a new frame.

LollyKat
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Location: Scotland

Re: Reynolds 631

Postby LollyKat » 3 Feb 2020, 10:36pm

David9694 wrote:When you say welded, do you mean fillet brazed?


Not being an engineer I'm not too sure of the difference :oops: . I meant lugless.