spanner or socket

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JohnnyBeckett
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spanner or socket

Postby JohnnyBeckett » Mon Jul 29, 2019 10:32 pm

can someone tell me the size of socket or spanner to fit gearbox sprocket nut on a GB gearbox 1954 350 nh is it BSW OR BSF OR AF

Mick D
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Re: spanner or socket

Postby Mick D » Tue Jul 30, 2019 7:02 am

Hi

It's 1" Whitworth - I bought a box spanner from here, very pleased with it:

https://www.ffx.co.uk/tools/product/Mel ... -X-1-X-7In

Regards Mick

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Re: spanner or socket

Postby john.whiting » Tue Jul 30, 2019 9:52 am

Is this the rear sprocket /sleeve gear nut?.........seems to be around 53mm across flats.

JohnnyBeckett
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Re: spanner or socket

Postby JohnnyBeckett » Tue Jul 30, 2019 7:28 pm

THIS IS THE GEARBOX SPROCKET NUT FOR THE THE REAR CHAIN MY NUT IS 42.49 MM ACROSS THE FLATS THE CLUB SPARES ARE SAYING IT 1.1/4 WW BUT I AM NOT SURE IF THIS IS RIGHT I DO NOT TO GET ONE ON EBAY AND IT IS THE WRONG SIZE

Mick D
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Re: spanner or socket

Postby Mick D » Tue Jul 30, 2019 7:45 pm

I refer you to my previous post - measure your nut and look up the tables.

My nut came from a 54 GB6 box and is now fitted to a 58GB44 one - it's 1" W.

Regards Mick

JohnnyBeckett
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Re: spanner or socket

Postby JohnnyBeckett » Wed Aug 07, 2019 6:20 pm

HI Mick you are right i have got a new nut and a 1" B S W Socket Thank You for your help

malcolm.johnson
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Re: spanner or socket

Postby malcolm.johnson » Thu Aug 08, 2019 8:41 pm

Here is mine. I needed a spanner in a hurry so used some 1/4 plate I had. Centre punch, dividers, drills and a file. A good hours work and only ever used it once!
Attachments
home made spanner.JPG

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simon.holyfield
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Re: spanner or socket

Postby simon.holyfield » Fri Aug 09, 2019 12:19 am

Me too, here:

http://ariel-square-four.blogspot.com/2 ... r.html?m=0

It's all too easy to spend hard earned cash on something you hardly ever use.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'78 CX500
http://ariel-square-four.blogspot.com

Mick D
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Re: spanner or socket

Postby Mick D » Fri Aug 09, 2019 5:34 am

Hi

It's worth bearing in mind the access to this nut:
It's recessed into the sprocket, (this is compounded if you use the secondary chain as a means to restrain rotation during removal / installation).
If you have a FERC configured bike the forward section of the FERC has to be installed before the sprocket and thus recesses the nut even further.
The above result in a plate spanner only being able to partially engage at best.
The extension of the main shaft through the nut precludes a normal design socket from fitting, the thickness of the nut also renders an unmodified socket engagement to around 50%
GB Sprocket.png
GB Sprocket.png (186.57 KiB) Viewed 499 times

£12 for the correct box spanner is money well spent in my opinion

Regards Mick

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simon.holyfield
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Re: spanner or socket

Postby simon.holyfield » Fri Aug 09, 2019 8:12 am

Absolutely. The other thing I like about box spanners is that they are very easy to modify - with an extension tube for example, and you can often store them inside each other.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'78 CX500
http://ariel-square-four.blogspot.com


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