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PostPosted: Sun Nov 30, 2008 12:35 am 
retrobike rider
retrobike rider
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Joined: Mon Apr 30, 2007 12:31 pm
Posts: 2482
Location: ManchestOr
follow on from my musings here

http://www.retrobike.co.uk/forum/viewto ... highlight=

Quite happy,

I knew that single speed gearing 44 - 15 worked as i tried it when I had gears so went with 46 - 16 which is almost the same ;)

and after trialing it with my retro chainsets own 46t I was surprised i'd landed the magic number, so ordered teh Thorn chain ring which looks sweet and hey presto magic number on a vertical drop out! 8) :D

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Its a bit stiff especially half way round but expecting the chain to 'stretch a bit anyway. I undid the chainring in situe but didn't make a difference, so hoping it will be ok... could also see if the sprocket is central too I suppose

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Massive improvement over the worn cheepy effort
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no wonder it chucked the chain off when i had gears :roll: :)

Thanks and comments welcome


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PostPosted: Sun Nov 30, 2008 12:45 am 
Retro Guru
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Joined: Wed Sep 20, 2006 11:23 am
Posts: 1256
Location: Winchester
Depending on the frame (& your future plans for it), you can modify the dropouts a li'l bit with a round-edged file & get a little bit of horizontal adjustability in there... Nice not to have a tensioner though, isn't it! :)

Have you got a nice big chain on there, & a chunky sprocket too?


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PostPosted: Sun Nov 30, 2008 1:05 am 
retrobike rider
retrobike rider
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Joined: Mon Apr 30, 2007 12:31 pm
Posts: 2482
Location: ManchestOr
Yeah its a Thorn branded CNCring and a SRAM PC1 plus a Shimano DX from Londonfixieshop, it does feel good, :D

Just went round outside to try it and feels nice, lets just hope no headwinds spoil me fun :D

:idea: thanks for tips, i did read about filing the axle flat

got the bug now,debating either single or 7 speeding my Raleigh Apex for light weight offroad, and then that old frame I have has horizontal dropouts, spotted that just after I was gonna try sell it :?: decisions decisions

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