Thorn Eccentric Bottom Bracket Insert - Fits Raven Tour / Mk1 Sport Tour Only

£29.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Fits early Thorn Ravens with shell width of 58mm (outside edge to outside edge).

With 5 cutouts for adjustment spanner, NOTE: circular manufacturing mark by 3rd cutout to go on chainring side.

- Colour: Black
- Diameter: 51.2mm
- Length: 68mm
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Questions & Answers (7)
Eccentric bottom bracket
16 May 2022
I have the bracket shown here and would like to adjust it. What tool do you recommend to insert and twist? I had thought of a pin wrench but the pins look too thin.

Many thanks.
For any information or advice on any of Thorn bikes, frames and forks or parts, please contact our dedicated Thorn bikes sales team either on 01278 441505 or [email protected] and they'll be able to provide you with all of the information you need.
I'm looking for an eccentric bottom bracket adapter for a frame I'm building up
08 Mar 2020
I'm looking for an eccentric bottom bracket adapter for a frame I'm building up, bottom bracket is a BMX style 51.5mm diameter 68mm long. I'm wondering if this would be suitable to use.
In theory, this would probably work, we would prefer to test fit to confirm.

Thanks - 09/03/20
Can I use this ebb on a 2009 felt solo 9?
16 Jan 2020
I did some measurements with the ebb that came with it and it had the same measurements. I do not like the felt one as it uses a wedge, also would it be possible for you to email the instructions or point me to were I could find them on the web.

Hi, I don't think you can. This insert is designed for use with Thorn frames that have two set screws in the bottom bracket shell which are used for adjustment and position fixing. I believe the 2009 Felt Solo 9 does not have these screws as it uses a wedge system. There are no instructions but here is a link to a blog showing how it works. Thanks 16/01/2020
Advice on correct BB
02 Dec 2018
Thorn Raven Tour Bottom Bracket
« on: Today at 10:34:18 AM »
Hi. Just doing some routine maintenance on my pre-owned 2008 Raven Tour and decided to check out the bottom bracket as it looksed a bit ropey, it’s taken quite a bit to remove the BB itself not the eccentric shell. Due possibly to 3 reasons. 1 the length of time it’s actually been installed??. 2 someone in the past has tightened the retaining screws of the eccentric shell in the wrong position into the thinnest part of the shell damaging the internal threads, lastly I think the BB I’ve removed could be the wrong size as it’s a 73mm Shimano UN-54 with a over all length of 110mm..
I’m thinking it should be a 68mm but unsure of the overall length? Can you advise please.
As going to purchase a new eccentric shell and may as well get the correct size BB at the same time. Thanks
The 2008 Raven Tour uses a 68mm wide BB, its likely to simply be the amount of time it has been fitted.

Thanks - 03/12/18
Tour Raven Wrench
13 Apr 2017
Hello,I Recently Bought A Thorn Raven. The Serial Number Is . My Question Is I Dont Have A Wrench For The Eccentric Bb. Which Whrench Should I Get For This Bike?

If the Raven you recently bought was from new or if it was from the last few years then the tool you need is SJSC part 12076. However if the bike is much older and if it has a black eccentric (like this one you have left this question on) then the tool you need is SJSC part number 11237.

What'S The Inside Thread Specs?
10 Jun 2016
thread size and type

The internal thread is standard British bottom bracket thread of 1.375" x 24TPI.

How Much Would Shipment To The Us Be For A 51.2Mm Bb
13 Aug 2014
I am looking for an eccentric bb for a Burley runabout. It is 51.5mm by 68mm. What would the price be in US dollars to get it over here.

Hi, your best option is to simply add the item to your basket & follow the instructions from there, the website will then work out the postage for you. Regards, Jamie