South Salem Cycleworks: Salem, Oregon
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Vintage Components - Specialities T.A. bottom brackets and bottom bracket parts

On this page: T.A. 344 double-chainring spindle | English-threaded Adjustable cup | Swiss-Threaded (35 x 1) cup set

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Specialities T.A. is a French component maker founded in 1947 by brothers Georges and Louis Navet.

Before moving on, we'll answer the question almost everyone asks. What does the "T.A." stand for? The brothers originally intended to make a front-wheel drive bicycle, in French "traction avant". The brothers never pursued their original inspiration, but almost three-quarters of a century later, the name has still stuck.

Instead, the brothers began making chainrings that would fit the Stronglight 49D crankset. From there, they branched out into their own cranksets, pedals (with needle bearings), bottles, shoe cleats and other items.

The Navets started in Clamart, just southwest of Paris. Since 2010, the T.A. factory is in Sissone, between Paris and the Belgian border.

The various cranks T.A. produced usually had a very small "Q Factor", the distance between the outside of one crank to the outside of the other.

Spindle notes:

For those buying our vintage T.A. spindles, they have ISO square spindle taper. These are compatible with Campagnolo, older Stronglight, Nervar, and of course, T.A.

If you have a JIS crankset (Ritchey, S.R. most Shimano, Specialized and Sugino) the crankarms will sit about 4.5 mm closer to the frame when using an ISO spindle than if a JIS spindle were used.

T.A. 344 spindle for double-chainring cranksets. Lightly used, $60.00

  • Made for double-chainring cranksets
  • This spindle is 115mm long.
  • 76mm center width factor (Sutherland's distance between bearing shoulders)
  • ISO square taper

TA 344 spindle

Double spindle with light wear

T.A. English-threaded Adjustable cup with lock ring. Used

TA adjustable cup

Here's the outside of the cup

TA adjustable cup

Here's the bearing surface.

T.A Swiss-Threaded (35 x 1) cup set. Used, $50.00/set

Important: Swiss-threaded fixed cups have left-handed threads: 35 mm X 1mm (25.4 tpi).

We have three sets: #1 | #2 | #3

T.A Swiss-Threaded (35 x 1) cup set #1. Used, $50.00/set

TA bottom bracket cups

From the outside

TA Swiss cups

The cups turned over to show their bearing surfaces

T.A Swiss-Threaded (35 x 1) cup set #2. Used, $50.00/set

TA Swiss cups

The outside of the cups

TA Swiss cups

Here are the insides, showing the bearing surfaces.

T.A Swiss-Threaded (35 x 1) cup set #3. Used, $50.00/set

TA Swiss cups

The cups' outsides

TA Swiss cups

Here are the bearing surfaces