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#1
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Stronglight double to single
Hi
I've got an old Stronglight chainset that I'd like to convert to a single ring for a fixed gear project. I've no idea what model it is and I don't have it with me to look, but it has two rings and the big ring has lots of little holes drilled in it beneath the teeth, presumably to save weight. It looks like this: http://www.velostuf.com/stronglight99x31.jpg It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano sets, but does (IIRC) have some bolts quite close to the centre of the chainset, like the picture shows. Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? Cheers, Mark |
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#2
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Stronglight double to single
Mark wrote: Hi snip Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? Cheers, Mark a) no idea. b) You've got one - use the middle ring (somewhere between 36t-42t), with shorter stack bolts. You can use the middle or outer positions to get the best chainline. You could use the large ring (46t-53t?) with a larger rear cog if you wanted, you just need to figure out what final ratio you want, what cogs are available, and therefore which of the two front rings will get you closest to the ratio with one of the available cogs. If this is a track chain v. road chain issue, rear cogs are available to suit either chain, so there's no absolute need to change the chainring. ....or is there somthing obvious I'm missing? Wouldn't be the first time. hth bookieb. |
#3
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Stronglight double to single
Mark wrote:
Hi I've got an old Stronglight chainset that I'd like to convert to a single ring for a fixed gear project. I've no idea what model it is and I don't have it with me to look, but it has two rings and the big ring has lots of little holes drilled in it beneath the teeth, presumably to save weight. It looks like this: http://www.velostuf.com/stronglight99x31.jpg It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano sets, but does (IIRC) have some bolts quite close to the centre of the chainset, like the picture shows. Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? Cheers, Mark Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm boltcircle. You could use the chainrings you have (with shorter chainwheelbolts) but finding other rings will be a challenge -- --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
#4
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Stronglight double to single
On 2006-05-02, bookieb wrote:
Mark wrote: Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? a) no idea. b) You've got one - use the middle ring (somewhere between 36t-42t), with shorter stack bolts. You can use the middle or outer positions to get the best chainline. You could use the large ring (46t-53t?) with a larger rear cog if you wanted, you just need to figure out what final ratio you want, what cogs are available, and therefore which of the two front rings will get you closest to the ratio with one of the available cogs. Oh, yes. Forgot to mention: it looks like both the rings are one inseperable piece (which itself may come off of the cranks) so I can't just mount the inner on the outer, so to speak. If this is a track chain v. road chain issue, rear cogs are available to suit either chain, so there's no absolute need to change the chainring. Nope, not too fussed about that. Cheers, Mark |
#5
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Stronglight double to single
Mark wrote:
Hi I've got an old Stronglight chainset that I'd like to convert to a single ring for a fixed gear project. I've no idea what model it is and I don't have it with me to look, but it has two rings and the big ring has lots of little holes drilled in it beneath the teeth, presumably to save weight. It looks like this: http://www.velostuf.com/stronglight99x31.jpg Well, that's a picture of a Stronglight Model 99bis, according to this: http://www.velostuf.com/gallery.htm But is that your chainset, because that is a triple and you say you've got a double. It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano sets, but does (IIRC) have some bolts quite close to the centre of the chainset, like the picture shows. Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? a) mentioned above. b) as mentioned by bookieb, you've already got two, unless they are too worn or you just want a shinier or lighter one. If so, talk to Spa Cycles who seem to have knowledge and stock of Stronglight chainrings. I'm not sure I've ever seen a chainset too worn for use on a fixed gear bike, though. JimP -- Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all. - DNA |
#6
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Stronglight double to single
"M-gineering" wrote:
Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm boltcircle. You could use the chainrings you have (with shorter chainwheelbolts) but finding other rings will be a challenge Let's be charitable and call it obsolescent. Settle Cycles and Spa Cycles still carry a range of rings: http://www.spacycles.co.uk/products.php?plid=m2b0s149p0 http://www.settlecycles.co.uk/shop/o...id=196&pid=711 But from the further description "Mark" gives, I'm not convinced that he doesn't have a 49D or similar crankset with a 50.4mm primary circle, in which case TA Cyclotourist rings, also from Spa, would be just the ticket: http://www.spacycles.co.uk/products.php?plid=m2b0s148p0 James Thomson |
#7
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Stronglight double to single
M-gineering wrote:
Mark wrote: Anyone have any idea a) what sort of chainset it might be, and b) whether I can get a single ring for it? Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm boltcircle. You could use the chainrings you have (with shorter chainwheelbolts) but finding other rings will be a challenge Spa Cycles, frequently recommended in this parish, are your friends. Or at least they were my friends a few weeks ago: a whole range of 86mm BCD rings at very reasonable prices. Worth phoning - they've got more stock than the website suggests. John |
#8
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Stronglight double to single
Mark wrote:
Oh, yes. Forgot to mention: it looks like both the rings are one inseperable piece (which itself may come off of the cranks) so I can't just mount the inner on the outer, so to speak. angle grinder Inseparable??? /angle grinder JimP -- Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all. - DNA |
#9
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Stronglight double to single
"Jim Price" wrote:
Well, that's a picture of a Stronglight Model 99bis, according to this: http://www.velostuf.com/gallery.htm But is that your chainset, because that is a triple and you say you've got a double. 86mm bcd doubles and triples use the same cranks. The triple has the granny ring spaced out on long stack bolts on the same bolt circle. James Thomson |
#10
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Stronglight double to single
Jim Price wrote: angle grinder Is someone playing my tune? ...d |
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