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IIRC (one jumbo caveat!
) our T-Mar hath writ that five ridges make a steerer a product from good old A.L. Colombo
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there is a Riggio brochure from roughly this time archive here -
https://bulgier.net/pics/bike/Catalogs/riggio/
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Last edited by juvela; 02-25-21 at 11:13 PM.
Reason: addition