http://www.youtube.com/bikemanforu How do you know what kind of chain you need for your bike" YouTube's how-to guru of DIY bicycle repair shows you in this tutorial. Free Shipping http://www.bikemanforu.com on bike parts, tires, tools, and cycle accessories. "Sticks and stones will break my bones but chains and freewheels excite me," BikemanforU says. This instructional video shows how to spot the important difference between freewheel and cassettes and demystifies what 1/2 x 1/8 or 3 x 3/32 really mean when it comes to sizing up your chain. He uses a vernier caliper to show how to measure center of the pin/ "Center to center of the pin to get a half inch," he explains. "Now, what's the difference between an eighth and three thirty seconds? How many three thirty seconds is an eighth of inch? Four is the answer. So there's only one thirty second of an inch difference between the two." Using a micrometer, he shows us the distance/difference, then shows how to measure the micro difference in thickness between the link. So now, that's what we had way back when. Enjoy a quick mid-century history lesson on bicycle chain, too. "Back in the day that's all there were," he says. "Now, here comes 12 speed bicycles, which means six speeds in the back. Then mountain bikes come along, well basically, a mountain bike was one of those old school Schwinn middleweights with some gears and stuff. They were cruising down the mountain on coaster brakes, drifting on the side of the mountain. Then comes 10 speeds on the back, and I think Campagnolo even has 11 speeds in the back. What's the difference between a freewheel and a cassette? If you still can't figure it out, check out this video. Anyway the distance on a wheel hub is the dish, the flatness. "These spokes can only get so flat. Now you've got to get 10 speeds in the same amount of distance. So the chains had to get skinnier. The sprockets in the back had to get closer and closer and closer." He shows the quarter-inch difference on a micrometer. Chains got skinnier and skinnier and skinnier. That is the story behind the chain. Now there's multitudes of new chains out there. You can cheat a little bit. Shiano, 6 7 or 8 speed. We do a specific 7 speed chain Z7, also good for 18, 21, and 24 speed bikes. We also do a little fatter 18-speed chain, which is a six speed chain (with a triple crank). The tutorial covers 5, 6, 7, 8, 9, and 10 speed chains. If you're not sure what you need for your mountain bike, cruiser, hybrid or road bike, BikemanforU has a recommendation. "Bottom line is however many sprockets you have in the back get the right amount of chain in the back. If you're doing Campagnolo, I strongly recommend you stick with Campagnolo. Shimano? I have no problem using the KMC chains with Shimano stuff. Campy is its own little deal…Campy is Campy. Let the Italians be." Learn more with BikemanforU's complete Bicycle Chain Playlist http://bit.ly/14HC1v6 Thumbs up if you like what you see. For the craziest, funniest, most informative videos on DIY bike repair, tune into BikemanforU Channel. Subscribing's free for new vids every week!