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 Post subject: Chainring advice
PostPosted: Thu Jan 23, 2020 10:28 pm 
Dirt Disciple

Joined: Sat Jun 18, 2011 7:19 pm
Posts: 95
Location: Scottish Borders
I'm looking at a tandem and wanted to know if I can get hold of replacement chainrings, specifically to get smaller rings than currently.

The exisiting rings on the Stronglight crank are 50-38 I think. The BCD looks small but I'm unsure what it is. The small ring may fit to the rear of the big ring or does it go directly onto the spider, I'm unsure?

Anyway, if anyone is familiar with this crankset (it's very beautiful!) and can advise it will be most appreciated.

For the Suntour Cyclone rear derailleur, does anyone know what I could go to for a biggest rear sprocket, I was thinking maybe 14-28 ( 6 block screw-on)?


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 Post subject: Re: Chainring advice
PostPosted: Fri Jan 24, 2020 7:01 am 
r.B.o.T.M. & P.o.T.M. Winner
r.B.o.T.M. & P.o.T.M. Winner
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Joined: Sun Jul 11, 2010 1:41 pm
Posts: 2824
Location: Plymouth, UK
This is a Stronglight 99 BIS, the inner chainring fits onto the reverse of the spider. These are an 86mm BCD. A more compact 48/36 set up may be better.


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 Post subject: Re: Chainring advice
PostPosted: Fri Jan 24, 2020 8:53 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9700
Location: New Forest, UK
Spa Cycles still carry them I think; also there are plenty on eBay.


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 Post subject: Re:
PostPosted: Fri Jan 24, 2020 8:54 am 
Dirt Disciple

Joined: Sat Jun 18, 2011 7:19 pm
Posts: 95
Location: Scottish Borders
Many thanks! I was thinking 48 34, yes, I see spa sells them for about 20 quid. Great!


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 Post subject: Re:
PostPosted: Fri Jan 24, 2020 11:54 am 
Old School Grand Master
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Joined: Fri Dec 10, 2010 10:40 pm
Posts: 4549
Location: The Royal Society of Insobriety
Great cranks, you can run them as a really compact 42/28 double too.


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 Post subject: Re: Chainring advice
PostPosted: Mon Jan 27, 2020 4:38 pm 
Retro Guru

Joined: Tue Feb 23, 2010 1:56 pm
Posts: 1103
Location: West Yorkshire
Regarding the rear mech, I've run a Cyclone up to 26t with no problems but found it a bit clunky with a 28t sprocket. There wasn't quite enough clearance between the jockey cage and the sprocket for a smooth change. That was a short cage Cyclone 7000 rather than the MkII I assume you've got. If you've got a long cage (GT) mech that supposedly handles a 32t sprocket but I've never run one on anything bigger than 28t.

I should qualify my experience by saying the short cage mechs are rated up to 28t if you've got Suntour dropouts as they have more drop between the axle and the hanger. Mine is on Campag dropouts hence only going up to 26t.

Mark.


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 Post subject: Re: Chainring advice
PostPosted: Mon Jan 27, 2020 5:11 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9700
Location: New Forest, UK
Using a mech dropper (£2 or so on ebay) allows all kinds of possibilities and is worth a try.


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 Post subject: Re:
PostPosted: Mon Jan 27, 2020 5:48 pm 
Dirt Disciple

Joined: Sat Jun 18, 2011 7:19 pm
Posts: 95
Location: Scottish Borders
Thank you for your help, all!


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