Thorn Eccentric Bottom Bracket Insert - Fits Raven Mk2 Sport Tour / Catalyst / Enduro / Sterling / Twin Tandem

Customer Reviews (2)
4 / 5| Write your review
£29.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Fits the following Thorn bicycles:
- Raven Mk2
- Sport Tour
- Catalyst
- Enduro
- Sterling
- Raven Twin Tandem Mk1 & Mk2
- Nomad Mk1 (S&S)
- Nomad Mk2

Best used with conventional square taper bottom brackets (73mm). The 2 holes on the eccentric go on left hand side of bike.

- Colour: Black
- Diameter: 51.2mm
- Length: 73mm
Product Reviews (2)
Questions & Answers (4) Q & A
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Product Reviews (2)
Overall Product Rating 4 / 5
Nice piece of kit.
By Bo Larsen
03 May 2018
4 / 5
I recommend this product
Fittet perfectly into my tandem frame, very light weight. Nice quality.
Good Fit
By William Stevenson
08 Aug 2011
4 / 5
I recommend this product
The old insert had been dostorted by not using the proper tool, so was difficult to remove. New one fitted perfectly when fully greased, and I intend to look after this one.
Questions & Answers (4)
can I use it with BSA Bottom bracket 1,370"
26 Jun 2023
how is the dimention of the bracket hole?
The threads are for a BSA or English type bottom bracket. SK 27/06/23
The original insert on my Sterling is not black but a gold colour.
30 Aug 2018
I see there is another, similar insert 16620 which is a similar colour to the one I have here. Which should I order for my 2009 Sterling?
Hi, you could use either. 16620 will fit your Sterling and will allow the use of external bottom brackets if you need too.
I Have A Couple Of The Halfords Original Folding Bikes.
11 Mar 2015
They have a BB i.d. of 51.3mm (unthreaded) and a shell width of 69mm. Will the Thorn insert fit satisfactorily? They appear to take JIS axles/cartridge bearings. How much eccentricity is available please?

Unfortunately this eccentric shell is too short to be used within your frame and none of our other eccentric shells match your dimensions either I'm afraid.

How Long Does The Bottom Bracket Have To Be?
02 Dec 2013
I have a thorn catalyst, and the bb now has play. I can see it has to be 73mm, but what length do I need please?

I cannot know the length for sure because it is the overall length is relevant to the cranks not the actual frame. The cranks that would have come as stock on your bike have long been discontinued but as far as I'm aware they were designed around a 110mm bb but I can't say for definite.