Jump to content

1939 Sunbeam B24/25T gear ratios


SteveCarver
 Share

Recommended Posts

Hi folks,

I'm new to this forum but have read several posts here and it sounds like some of you might have the knowledge I'm after.  I am working on restoring a 1939 Sunbeam B24/25T and have been searching high and low for information on likely ratios in the Burman box. I admit to knowing next to nothing about trials machinery but the bike is in my workshop and I've committed myself to it as the next project. The bike came to me (loosely put together) with both the 350 and the 500 engine, the latter in frame. The former has had a hard life but may yet be saved. The 500 came from Lithuania (apparently) but is in good order. I digress but the 350 or 500 engine is perhaps relevant as regards gearing. Anyway, the bike also came with two Burman CP boxes. They might be from anywhere (who knows?) but are geared as follows:

#1 Main shaft: 30/23-18/27 Lay shaft: 20, 27/18-18/32,23

#2 Mainshaft: 32/23-18/29 Lay shaft: 18, 27/18-18/32,21

Are these any use? I know that the 500s were originally fitted with the heavier/stronger BAP box, so I'm currently on the look out for one.

Any help or hints would be gratefully received.

Best regards,

Steve

 

Link to comment
Share on other sites

 

I could get shot down in flames here but I reckon you have with the #1box that’s for the 350 and #2 is for the 500. You may get more useful help and information from Old Bike Mart, there are many subscribers to this paper and some are very knowledgable. You may even be able to make contact with a few Sunbeam owners. Have you tried the Sunbeam Owners Club??

Link to comment
Share on other sites

 
 
On 17/04/2018 at 10:07 AM, section swept said:

I could get shot down in flames here but I reckon you have with the #1box that’s for the 350 and #2 is for the 500. You may get more useful help and information from Old Bike Mart, there are many subscribers to this paper and some are very knowledgable. You may even be able to make contact with a few Sunbeam owners. Have you tried the Sunbeam Owners Club??

You might be right. I take OBM but never thought of writing to them for advice. Thanks.

Link to comment
Share on other sites

 
 
 

Bonhams Auction this weekend – lot 89

A Canterbury Trials Sidecar,

mid 1950's, has undergone a full restoration since acquisition forty years ago by the current owner, aluminium-skinned finish.

SALEROOM NOTICES

This sidecar is that of the same type used by Ariel works rider Frank Wilkins in the International Six Days Trial. Included with the sidecar are fittings for Ariel HT5 and mid 1950s Triumph spring frame models together with a Canterbury spares catalogue.

The online catalogue includes a photo

Link to comment
Share on other sites

 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...