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Specialties TA Massed Start Chainrings?

Old 06-05-12, 05:29 PM
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Specialties TA Massed Start Chainrings?

What's the difference with these and the Touring or Club Riding chainrings? Can I attach a third ring to this set by buying a the proper bolts and a third chainring?







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Old 06-05-12, 07:23 PM
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I have a few adapters that I made that would allow you to run a single chain ring and use common 130 bcd rings. You could probably run two rings if you use some chainring bolt spacers.
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Old 06-05-12, 08:30 PM
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Ha, I've never seen the anglicized naming schemes for the different bolt patterns. The difference between all these patterns simply is the placement of the inner ring bolts, or the bolt circle diameter (BCD).

The "Massed start" is also known as the "Criterium" pattern which has a 152BCD.

The "Club riding" is also known as the "Randonneur" and has a 116BCD.

The "Touring" is also known as "Cyclotouriste" and has an 80BCD. This is the most versatile pattern and allows for triples ranging from 26 to 56T.

I could be wrong, but I think the reason for the larger BCD drillings is to provide more lateral rigidity to the ring pairs. The Criterium pattern is designed for racing (hence the names "Massed start" and "Criterium"), so the drillings are placed farther out on the ring, allowing the inner and outer rings to reinforce each other.

All sets have the same crank drilling on the outer ring, 50.4BCD despite the different inner ring drillings. They all work on cranks designed for 50.4BCD outer rings.

The BCD is the determining factor for how small an inner ring can bolt to the outer ring. In theory, all TA rings can be made into triples, it's just a matter of practicality that you wouldn't want to make a triple from the Criterium set, since the smallest ring made in the 152BCD pattern is 44T. Unless you wanted something like a 58/52/42 or something like that, but that would seem sort of silly. By contrast, the Cyclotouriste pattern allows rings as small as 26T, so triples in that pattern make more sense.

Personally, I've been most happy with making compact doubles using the Cyclotouriste pattern, with something like a 34/48 combo.

It looks like you're stuck with using your Criterium set as a double. Of course, you can sell the ring pair on eBay and replace it with a Cyclotouriste or Randonneur set... they all use the same crank arms!

Last edited by southpawboston; 06-05-12 at 08:41 PM.
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