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Post by slowroller on May 16, 2015 16:58:20 GMT
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Post by velocipete on May 16, 2015 19:00:55 GMT
That would fit if your chainset has the TA "adapter".Probably not,cusquino will be along to say soon.
Some TA inner chainrings will bolt straight onto the outer ring,particularly the smaller sizes.
Hope this helps. Good luck.
Cheers,
Pete
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Post by slowroller on May 17, 2015 0:32:41 GMT
How can I know which TA ring would be the direct fit?
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Post by velocipete on May 17, 2015 6:22:01 GMT
You need to measure the bolt circle diameter of the outer holes on your chainring.Use this when looking for a new inner.
I assume the inner bcd is 50.4 mm,standard TA.
Cheers,
Pete.
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Post by cusqueno on May 17, 2015 21:33:41 GMT
I'm not a TA expert but I understand there is still a wide range of rings sold for the various BCDs. Try a shop specialising in touring components. I believe the 50.4 to six hole adapter that Pete mentioned is part of the Criterium range, rather than the Cyclotouriste one, FWIW.
Incidentally, I was looking for a crankset with as small a small chain wheel as possible in my bits boxes and found an SR one (as fitted to many Viscount's) with a forty tooth ring.
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Post by cusqueno on May 18, 2015 13:50:06 GMT
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Post by slowroller on May 19, 2015 3:59:30 GMT
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Post by slowroller on May 19, 2015 4:02:26 GMT
A related question: if I find a chainwheel that will work, what is the hardware that spaces it apart from the large chainwheel, and who has that (or those)?
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Post by velocipete on May 19, 2015 5:56:59 GMT
The Stronglight 49d chainrings are interchangable with the Viscount,as are TA.
The large chainrings all have a bcd of 50.4mm. The chainring bolts and spacers
can usually be found on the same website that is selling the rings.
Cheers,
Pete.
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Post by cusqueno on May 19, 2015 17:13:15 GMT
Note that the Viscount chain set was designed to use the maximum number of different fixings possible. I'm not sure if any rationalisation is possible, for instance by using TA or Stronglight nuts, spacers and bolts.
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Post by 54roadie on May 20, 2015 17:25:28 GMT
A related question: if I find a chainwheel that will work, what is the hardware that spaces it apart from the large chainwheel, and who has that (or those)? It so happens that I have a Lambert right crank arm, 52t porthole ring, and the bag of hardware. No inner ring, though. I'll check later to be sure it's complete. I've used aluminum brake mounting spacers to hold chainrings apart, never had a shifting issue that way. If the hardware is complete, I'll separate the bag from the rest, no problem. |
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Post by velocipete on May 20, 2015 18:14:23 GMT
Now that's one of the things I really love about this site.
We all help each other to keep the bikes on the road.
Couldn't have happened without the internet,so I can,perhaps,
forgive all the rest of the rubbish that's on there!
Keep up the good work folks.
Cheers,
PEte.
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Post by 54roadie on May 21, 2015 2:42:02 GMT
My bag of hardware seems to be incomplete. I have the five bolts and nuts to hold the outer to the crank arm, and the lower most six bolts to hold the inner to the outer ring, complete with spacers. But I'm missing the six upper, smaller, button head allen bolts and spacers. These bolts screw directly into the inner chainring, they don't have nuts of any kind. Mine have gone to the mystery place where little bolts, missing socks, loose ball bearings, and the occasional watch are all residing.
Area 51?
Also, what I have is not all that pretty, and some of the bolts don't visually match the others. Same size and thread, different look. I haven't checked to see if the local hardware store has shiny replacements.
Pete mentioned that the BCD on the 52 outer is 50.4, which, I believe is the five bolt pattern to hold the ring to the arm. I just checked the inner to outer BCD on my Lambert 52 porthole ring. Those six holes make it easy - diameter = 80mm Which, according to TA, is the BCD of the Cyclotourist rings. They say the inners are available in 40 and 42, but good luck finding them.
Does anyone know what the thread dimensions are on those upper bolts? Those should be an easy find, I'd think. Because (especially here in the US) I'm not gonna hold my breath for TA.
Frank
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Post by slowroller on May 21, 2015 7:47:49 GMT
Hey Frank, thanks for digging around. If you're like me, you never throw anything potentially useful away. Also I haven't made time to measure the hole spacing on my chain wheel, so the 80mm dimension makes it easy for me to hunt on the 'Bay. Again, much appreciated!
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Post by slowroller on May 25, 2015 4:04:18 GMT
Hi Frank- how much would you need for the hardware you were able to find?
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Post by stoatie on May 25, 2015 7:23:43 GMT
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bendo
Viscount
Posts: 538 
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Post by bendo on May 25, 2015 12:32:13 GMT
I did this once. It's a Stronglight 49d crankset, Viscount porthole ring and a 36t Stronglight small ring. AFAIK Stronglight and TA six bolt chainrings are all compatible. As you can see here, even though the 36t was too small for the outer circle of bolts, it was able to use the middle circle. There's a second pic below that shows the view from above. The small chainring is very similar to the one in OP's first post. HTH b   |
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Post by 54roadie on May 26, 2015 20:29:32 GMT
Hi Jon, I'm sending you a PM.
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