crwdns2934241:0crwdne2934241:0 mayer

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Use a Boley gauge and measure it.  http://www.amazon.com/Stainless-Steel-Dental-Vernier-Caliper/dp/B0087HKWA6/ref=sr_1_1?ie=UTF8&qid=1384457569&sr=8-1&keywords=boley+gauge

Or use a digital caliper:  [product|IF145-016]

Or call the bike store where you got the seat, tell them the make and model number of  your bike and ask them which seat you need to get.

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open