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

Customer Reviews (2)

5 / 5| Write your review

£29.99

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Details

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
- Standard British bottom bracket thread of 1.375" x 24TPI

Product Reviews (2)

Questions & Answers (7) Q & A

Specification

Downloads

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Product Reviews (2)

Overall Product Rating 5 / 5

Just what I needed

By Ian Sutcliffe

31 May 2023

5 / 5

I recommend this product

ConsHad to work out how it works with chain and frame but managed

ProsWorks well

Brilliant not costly and did the job

By Neil Philip Exton

27 Oct 2022

5 / 5

I recommend this product

ConsNo securing bolts in an American BB if BB Cartridge fitted.

ProsThe Bafang fittings secured it in position required

I have just successfully used this eccentric bottom bracket in an American BMX style bottom bracket to enable a Bafang Mid Drive electric motor to be installed. With the standard concentric American to EU converter fitted the motor could not be fitted because there was too little clearance but this was overcome with the eccentric model.

Questions & Answers (7)

Is this only eccentric bottom bracket for the Thorn Raven? Is there a guide to installing it?

By Anonymous

13 Oct 2022

SJS Customer Service:

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.

Eccentric bottom bracket

By Tim Start

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.

SJS Customer Service:

I'm looking for an eccentric bottom bracket adapter for a frame I'm building up

By Wolf

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.

SJS Customer Service:

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?

By Marcus

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.

Thanks
Marcus

SJS Customer Service:

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 https://bit.ly/2TsGQGr to a blog showing how it works. Thanks 16/01/2020

Advice on correct BB

By Ian Schofield

02 Dec 2018

Thorn Raven Tour Bottom Bracket
« on: Today at 10:34:18 AM »
QuoteModifyRemove
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

SJS Customer Service:

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

How Much Would Shipment To The Us Be For A 51.2Mm Bb

By Doug

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.

Thanks

SJS Customer Service:

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