-
-
-
-
-
-
-
If you want to keep your existing rear mech you'll need to check its capacity.
(The ability of the derailleur arm to take up slack in the chain) - assume for sake of argument 30T
you then take your chainset range in this case 14T, subtract that from your capacity and you've got a rear cassette range of 16T e.g. 12-28
if you want a top end of 32, that'll mean a cassette of range 16-32 (which you'll be unlikely to find off-the-shelf.
Alternatively you can make a mental note never to go into the big sprockets when in the big ring!!! - but that's rather risky -
-
-
-
-
-
^ I know nothing of tandems but the lugs on yours look typical of 1930's/1940's frames.
The headset is a Brampton and spares for this are easily obtained as George Longstaff machined a big batch which are now stashed away at the Tandem Club - same goes for bottom bracket sleeves, brake linings and eccentric BB shells and all the other specialist stuff - the tandem club shop can be found here - http://www.tandem-club.org.uk/_clubshop.htmIf you're keen on finding out what it is you've got, your best bet is probably the tandem club forum http://www.tandem-club.org.uk/_dboard.htm
Hope this helps
-
-
-
If you're serious about this I'd consider talking to these guys
http://www.printedmotorworks.com/pancake-motors/
IIRC they are keen to get involved with small R&D projects (within the realms of sensible business), but they're good guys, based in Alton (just down the M3). -
-
-
^ 2.5Nm is a typical limit for model robot servos*
Here are a couple to consider
http://www.servoshop.co.uk/index.php?pid=HITH7954SH&area=Servo
http://www.wheelspinmodels.co.uk/i/55592/- Please note: this information was obtained through professional activities as a product designer and does not infer any geeky hobbies (as if contributing to a fixed gear forum weren't bad enough)
- Please note: this information was obtained through professional activities as a product designer and does not infer any geeky hobbies (as if contributing to a fixed gear forum weren't bad enough)
-
^ Seatstay caps are similar to my Bob Jackson - lugs are slightly different, but the frame number looks to be a reasonable match.
Is the serial# on the BB?
Mine takes a 27.0 seatpost too - track bikes were often built of sterner stuff than their TT counterparts!!
More photos here - starting from pg 38 of this thread.
My frame number's 4854 from 1964
and Apolloxl has 4103 from 1960
On the RTTC forum there was a 1973 model at number 9359
Assuming they made roughly 500 per year it is worth investigating whether or not you have a ca. 1966/1967 Bob Jackson -
-
-
-
^ They had a reasonable reputation for bomb-proofness from the people I knew that used them - not as good as Middleburns, but not bad - the thing everyone hated was the screw-on spider that creaked all the time.
This review here says much the same - http://www.mtbr.com/cat/drivetrain/crankset/cook/e2-series/prd_350977_115crx.aspx





Someone nicked my front skewer last year - it was a fraught 3mile ride home trying to work out whether to put extra weight up front so the axle wouldn't pop out of the fork-end, or to lean back ready to poke a wheelie when the wheel fell out. Extra weight seemed to work (even over speed ramps)