Thorn Tandem bb size & crank rings?

[macspud]

Dan, in fact the Andra 40 weighs almost 100 grams less, per wheel, than the Andra 30.  Strange eh, considering the 40 has Ryde's highest load rating?

https://www.ryde.nl/andra-40
https://www.ryde.nl/andra-30

Pavel,
Looking at the pages you linked to The 26" version of the Andra 40 is 825g and the 26" Andra 30 is 696g.

Edit: Oh, Scratch that, I see Dan has first-hand knowledge and Ryde's figures are erroneous. I should know better than to start answering a post before finishing reading the thread. lol. 


 

[martyn]

Just in case anyone still wants to know, the bottom bracket shell on our Raven Discovery Mk 2 is 73mm wide so the choice of new square-taper cartridges is a bit more limited than for 68mm width. This bike came with Shimano BB-UN55 (no longer on sale new). These have a very free fit between the left side threaded fixing ring and cartridge body. The rear one of ours started to come unthreaded on the right. I have shimmed between the fixing ring and body with a wrap of can and done it up to nearly the Shimano recommended torque which is jolly tight indeed. Annoying squeak now gone.