On 12/19/2013 09:28 PM, Eric Norris wrote:
My first 650B bike is on the way, and I'm getting everything ready for its 
arrival (saddle, bar tape, bags, etc,). The only stumbling block so far has 
been innertubes. Even the best-stocked bike shop in town (we have seven here in 
Davis) doesn't carry tubes specifically for 650B.

So ... If 650B tubes aren't available, what flavor of 26" or 700 should I get? 
Is there a brand/size that works better? I'll be riding tires somewhere around 38 in 
width.

Depending on the brand, either 559 x 1.25/1.5 or 559 x 1.5/1.75. My LBS sells Specialized tubes, and with them it's 1.25-1.5. With the Maxxis Ultralight, which I like a lot, it's the IB59764000 1.5/1.75. If they carry them, one of the best is the Schwalbe SV-12. This fits a boatload of sizes, among them 650Bx30-42. You can get those from Compass or Rivendell by mail order.

You want to watch out for getting a tube that's too wide; that makes tire installation very hard, as it's quite difficult to not catch the edge of the tube under the tire bead.


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