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PostPosted: Wed Dec 28, 2005 2:56 am 
retrobike rider
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Joined: Fri Oct 28, 2005 1:10 am
Posts: 4473
Location: Bristol
Getting another Bonty soon but this one's for singlespeeding. Before I sell a kidney to buy an Eno eccentric hub or send it off to the surgeons at Argos for track mounts is there a chainwheel/cassette gear/half-link/goat sacrifice combination I can bodge to make everything run lush whilst retaining the original KB steel art?
Thanks in advance and Happy Trails................Mark


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 Post subject: KB sspd style
PostPosted: Wed Dec 28, 2005 10:07 am 
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Joined: Tue Sep 27, 2005 8:52 pm
Posts: 546
Location: South West
Not a great deal of help but KB wrote an article all about it once sspd'ing Bonty's...although from what recall a rear mech was made use of, and then the article got very keen on 2 speeds etc.


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 Post subject: Magic Ratio
PostPosted: Wed Dec 28, 2005 1:51 pm 
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Joined: Wed Jul 06, 2005 12:49 pm
Posts: 475
Location: Cairns, Australia
I down loaded a programme called ssConvert from

http://www.teambigtime.com/software/ssConvert.htm

But it doesn't seem to be working at the moment. There should be other programmes that do the same thing though.
If you want, measure the length of your chainstay in inches (hub to centre of BB), and i'll post the results. I could even email the programme to you if you want, though it is 1.93MB, so unless you have a fast connection, it may be a slow download.

It seems to work pretty well, on my old Litespeed, it has a 16.75" chainstay and it recomends running a 34:16, which is sort of loose, but still work fine.


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 Post subject: Chainstay length
PostPosted: Wed Dec 28, 2005 2:10 pm 
retrobike rider
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Joined: Fri Oct 28, 2005 1:10 am
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Location: Bristol
As per your instructions, my chainstay is 425mm long Tangent.


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 Post subject:
PostPosted: Fri Dec 30, 2005 12:30 pm 
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Joined: Fri Dec 09, 2005 3:49 pm
Posts: 771
Just in case anyone else is watching, someone on the MTBR Retro forum was running 36/18 without a tensioner or half link, and posted photographic evidence to prove so :D


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 Post subject: Magic Ratio
PostPosted: Fri Dec 30, 2005 2:36 pm 
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Joined: Wed Jul 06, 2005 12:49 pm
Posts: 475
Location: Cairns, Australia
Ok I found a conversion table – it shows 425mm = 16.73225 inch,
ssConvert gave the following results, the ‘T’ and ‘L’ after the ratios means that it will be a Tight fit or a Loose fit. These are for chains without a Half Link, with Half Links there are even more ratios. ssConvert also gives you the ratio, gear inch, and speed at 60 and 120 rpm.

34 x 15 L
36 x 14 T
36 x 17 L
38 x 16 T
38 x 19 L
40 x 18 T
42 x 20 T
46 x 14 L
48 x 16 T
50 x 18 T
52 x 20 T


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 Post subject:
PostPosted: Fri Dec 30, 2005 9:21 pm 
Old School Grand Master
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Joined: Tue Jun 28, 2005 11:02 am
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Location: Wookey Hole
Seems like a bit of a shame to replace the dropouts out the Bonty but I guess they aren't particularly rare.

LQQK,

email me the program at admin@retrobike.co.uk and I'll host it up here.


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 Post subject:
PostPosted: Sat Dec 31, 2005 1:10 am 
Old School Grand Master
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Joined: Tue Jun 28, 2005 11:02 am
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Location: Wookey Hole
LQQK, nice one.

Program hosted here for anyone interested. No idea if it's freeware, shareware or something else. If there some reason for me not to host it just give me a shout....


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 Post subject: SS Bonty
PostPosted: Sat Dec 31, 2005 1:47 pm 
retrobike rider
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Joined: Fri Oct 28, 2005 1:10 am
Posts: 4473
Location: Bristol
LQQK,
I owe you a beer.
Rutteger,
can't get that program to fly on me Apple but cheers for the effort dude.


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