Thomson Oversize Rail Clamp are for saddles with carbon rails, these tend to be oval and larger, 7 x 9 mm and 7 x 10 mm being the common over-sized rail dimension.
So, if you have rails larger than 7 mm do you need this new clampset? Maybe, maybe not. Thomsons standard rail clamps can accommodate rails up to 7 x 10mm, but riders using their setback post with over-sized rails may have issues getting the saddle nose down. If this is you, the over-sized rail clampset will give you about 5 to 8 more degrees of nose down adjustment. The over-sized rail clampset is also more cosmetically appealing than the standard clamps on over-sized rails.
The over-sized rail clampset is compatible with any vintage Elite or Masterpiece seatpost.
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