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All DOWN Cycles MTB NewsMain MTB NewsLocal NewsTech Tips & Reviews
Tech Tips & Reviews
01/01/11
English (US)  
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Professional Tweaks, Tips & Reviews By "AJ" Picarello
I hope you find my Tweaks and Tips section helpful. If there is something you want to know about, send me an email and I will try to add that to one of my upcoming articles.

“I racked my bike and some POS stole my seat. Do you have a seat in stock that fits my bike?”
For some reason, customers assume that seat post size is standard. Low and behold their disbelief when I tell them that posts begin at size 25.4mm and go all the way up to 31.6mm in increments of a tenth of a millimeter!

Seat post clamps are not as much a headache. Make sure your clamp didn’t get nabbed as well. Typically one of four size clamps fit your bike: 28/30/32 or 34mm. You may have an odd ball size if your bike is 50 years old or was purchased at a department store.

You must bring your bike into the shop in order to buy a new seat post. Down Cycles measures the frame with a micrometer measuring tool. This measurement is a ball park figure. The frame has been clamped down on the post and the true inner diameter may differ from the clamp area. We trial fit new posts in the shop to determine the proper fit. For instance, a measurement at the clamp area may read 27.0mm on the micrometer. We then attempt to install a 27.0mm post in the frame, but it can be a sloppy fit. Then we fit a 27.2mm post and whamo, perfect fit. The 27.0mm post would not perform properly on a bike designed for a 27.2mm, no matter how crazy tight you make the seat clamp! You could also ruin or crack the bike frame tightening down the seat clamp onto the wrong size seat post.

Sorry you had your post stolen! Don’t make the ordeal any worse on yourself! Get the bike into the shop to buy a new post otherwise you will drive back and forth multiple times to get it right. Please don’t roll up for a new post without your bike with this much too common statement: “I need a post for my 94 fisher Y bike.” (My guess on that model would be a 31.6mm by the way).

A new alloy post, a decent seat and a bolt on clamp will set you back minimum $60.00. Sometimes we have old seats hanging around we can set you up with that would be OK on a station bike.
Next time you rack your ride, use a bolt on, not QR seat clamp or bring your seat, clamp and post with you after you lock up. It sucks that we have to live this way, but such is life. I’m not sure why thieves would want your grunge old seat. Defend yourself against stank seat sniffing weird-o’s for crying out loud. It’s a long ride home without a saddle!

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