Bigger tube size for tyre.
09-18-17, 12:47 AM
#2
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There's only loose correlation between nominal and actual size. So inflate it outside the tire to the unstrerched size (1-5psi), and compare to your tire.
Or, measure the flat width. The unstrerched round width will be about 2/3rds of that.
Don't forget that the tire is a bit smaller inside than outside. However, it is possible to stuff a SLIGHTLY larger tube into a tire, but it can make mounting a bit harder.
Or, measure the flat width. The unstrerched round width will be about 2/3rds of that.
Don't forget that the tire is a bit smaller inside than outside. However, it is possible to stuff a SLIGHTLY larger tube into a tire, but it can make mounting a bit harder.
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09-18-17, 03:23 AM
#3
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Most tubes fit a range of tire sizes. The Continental tubes I use come in two sizes that will fit my road bike, one with my tire size at the upper end, the other at the lower end of the suggested size range. The smaller tubes make mounting easier and save a few grams of weight. I don't know how legit this is, but I was told that using the larger tubes would reduce the rate of pressure loss and give a bit of added puncture resistance because the rubber wouldn't be stretched as much. I've used both and honestly the only noticable difference is that I have to be more careful not to pinch the larger tube when mounting the tire.
09-18-17, 08:26 AM
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If you haven't already bought the tube I'd suggest getting one that actually specifies it will fit a 650B X 1.5 tire. In my own case I have a 700C X32 (~1.25") and always select tubes that specify 700C X 28-32mm. It saves a lot of struggling to get the tube seated inside the tire before seating the open side of the tire on to rim. Your 27.5 tire is a tire mostly used on mountain bikes so I can see why you might be having trouble finding one that fits because most are larger than 1.5". Probably the best you can do is to order one online that specifies 27.5 X 1.5-1.75. Not ideal but easier to deal with than the larger tube. About what you would pay in many bike shops 1 or 2 Kenda 27.5 (650B) x 1.5" - 1.75" Schrader Valve Mountain Bike Tube | eBay
09-18-17, 09:17 AM
#5
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For my Brompton, Schwalbe 4 and 5 both fit, the 5 remains thicker when inflated inside the tire.. it is stretched less to fill the volume..
same thing applies to other A vs B choices..
same thing applies to other A vs B choices..
