Rear Sprocket

Ivor Collins
Posts: 98
Joined: Sun Mar 30, 2014 11:04 am
Location: Leighton Buzzard ish
Contact:

Rear Sprocket

Postby Ivor Collins » Fri May 08, 2020 2:28 pm

Can anyone help me to find a supplier of 1/2” pitch rear sprockets suitable for machining up to graft on in place of a worn out original?
Plenty of metric sprockets around but not finding imperial without going to Trumpland for one.

JohnnyBeckett
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 1195
Joined: Sat Jul 07, 2018 5:39 pm
Contact:

Re: Rear Sprocket

Postby JohnnyBeckett » Fri May 08, 2020 8:56 pm

HI Ivor i use B & C EXPRESS phone number 01522-791369 they make all my sprockets and my friends they are very good and make all types and sizes i am very happy with all the different types of sprockets they have made me :D :D

Ivor Collins
Posts: 98
Joined: Sun Mar 30, 2014 11:04 am
Location: Leighton Buzzard ish
Contact:

Re: Rear Sprocket

Postby Ivor Collins » Sat May 09, 2020 10:09 am

Thanks for the recommendation. I have emailed them.

Ivor Collins
Posts: 98
Joined: Sun Mar 30, 2014 11:04 am
Location: Leighton Buzzard ish
Contact:

Re: Rear Sprocket

Postby Ivor Collins » Tue May 12, 2020 12:36 pm

B&C could make me a sprocket but would come in at £40-50

Some interesting points raised - he says that all chain sprockets are imperial, they never went metric!
Why do I see lots of 13mm sprockets available then? May be only 0.3mm (0.012”) further between teeth but wouldn’t that start stretching the chain, when the chain is wrapped round 25 teeth that’s 7.5mm

Also, he says my 1960’s part book is wrong and the width cannot be .305, it has to be 5/16” 0.03125”

Any thoughts?
Attachments
29F5947B-2040-424C-8E86-E2C56ED7B489.jpeg

Simon.Gardiner
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 1058
Joined: Tue Aug 02, 2011 11:37 pm
Location: South West (Bristol-ish)
Contact:

Re: Rear Sprocket

Postby Simon.Gardiner » Tue May 12, 2020 1:24 pm

4-stroke primary chain is also specified as 1/2x0.305
Check the inside dimension between plates in the spec here for 1/2" pitch Renold
(given as 7.75mm which converts to 0.305 - for just the 3 decimal places)
http://simplybearings.co.uk/shop/p20038 ... _info.html

HTH

SG
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

JohnnyBeckett
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 1195
Joined: Sat Jul 07, 2018 5:39 pm
Contact:

Re: Rear Sprocket

Postby JohnnyBeckett » Tue May 12, 2020 1:28 pm

hi i find this a lot today the younger people can only work in metric if you give a lot of them a size of 23.5 inches they say what is that in metric :shock: :o

Ivor Collins
Posts: 98
Joined: Sun Mar 30, 2014 11:04 am
Location: Leighton Buzzard ish
Contact:

Re: Rear Sprocket

Postby Ivor Collins » Tue May 12, 2020 9:05 pm

Result!
Just in case anyone else wants one, Bearing Revolution stock them and cost just £12 plus delivery


Return to “Two stroke”

Who is online

Users browsing this forum: No registered users and 4 guests