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622x15 Tire Sizes

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Old 02-06-19, 12:51 PM
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richas
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622x15 Tire Sizes

Hi,
I have an older Blue Norcross EX CX bike. The wheels on it are 622x15. The tires it came with are 700x40c. From what I have found these seem to be too big for the rims:



I just ordered new tires, Challenge Gravel Grinders in 700x38C. Is this a problem?

Thanks
Rich
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Old 02-06-19, 01:03 PM
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Well, if the current 700x40c tires have worked adequately, the 38c tires should be OK too. Yes, you are right, a 15 mm internal rim is narrower than recommended for tires that wide but if you've been satisfied with the ride and handling, keep using them. If you just got the bike and haven't used it yet, strongly consider wider rims or smaller tires.
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Old 02-06-19, 01:28 PM
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Originally Posted by HillRider View Post
Well, if the current 700x40c tires have worked adequately, the 38c tires should be OK too. Yes, you are right, a 15 mm internal rim is narrower than recommended for tires that wide but if you've been satisfied with the ride and handling, keep using them. If you just got the bike and haven't used it yet, strongly consider wider rims or smaller tires.
Thank you for the input. No, I have had the bike for about a year and have done a lot of rides. I am guessing that they are not the original wheels.

Rich
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Old 02-06-19, 02:47 PM
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I'm afraid if you disregard the tire/rim fit police they will take your bike away. Andy
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Old 02-06-19, 02:58 PM
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Originally Posted by Andrew R Stewart View Post
I'm afraid if you disregard the tire/rim fit police they will take your bike away. Andy
They are busy at the moment. They are confering with the Cable Police and the Paint Police.
Something about a new rule book.
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Old 02-06-19, 04:47 PM
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What make/model are the rims? That is awfully skinny to be running 40s on, but I've come close to that difference and lived to tell about it. They just tended to roll in corners a bit if I didn't keep that pressure topped up.
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Old 02-06-19, 07:03 PM
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I have 42-622 tires on 15mm internal width rims. On these rims, the tires inflate up to about 38mm. They ride nice, but definitely do get less stable at lower pressures. I keep about 40 psi front and 60 psi rear on them and they do great. The only downside is brake pad clearance with rim brakes. With the cantilevers adjusted to the rims, I just BARELY have enough room with them unlatched to squeeze the tires out between the pads. But it works.
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Old 02-07-19, 09:31 PM
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Originally Posted by Wileyone View Post
They are busy at the moment. They are conferring with the Cable Police and the Paint Police.
Something about a new rule book.
Just make sure you tape your bars from the top down.

I've only used 32C tires on rims that narrow but would not be afraid to try wider.
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Old 02-07-19, 10:38 PM
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To be serious- I had a friend of my shop who ran some of the early Campy ATB rims. They certainly looked about as wide as their road ones did at that time. The tires were, as typical of then, about 2" wide (50mm aprox). He experimented with air pressure for max grip and came into the shop late one day with a story of prying off a section of his front tire's bead, out of the rim, when turning especially hard. But the tube didn't blow. He pried back the tire's bead into the rim and rode on. I suspect he had around 15 or less PSI. The rim likely was about 15mm inside width. So I consider this set of specs to be a limit of sorts for tube type tires with a hook edged rim. Andy
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Old 02-08-19, 11:26 AM
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Originally Posted by Andrew R Stewart View Post
To be serious- I had a friend of my shop who ran some of the early Campy ATB rims. They certainly looked about as wide as their road ones did at that time. The tires were, as typical of then, about 2" wide (50mm aprox). He experimented with air pressure for max grip and came into the shop late one day with a story of prying off a section of his front tire's bead, out of the rim, when turning especially hard. But the tube didn't blow. He pried back the tire's bead into the rim and rode on. I suspect he had around 15 or less PSI. The rim likely was about 15mm inside width. So I consider this set of specs to be a limit of sorts for tube type tires with a hook edged rim. Andy
Do you consider that the recommended 17mm width would make much difference?
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Old 02-08-19, 12:38 PM
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I think my friend's issues were both a very narrow rim, for the tire's width (resulting in the tire's beads not as effectively interlocking with the rim's hook edges) and the very low pressures he was playing with. He ran the same tires and rims for longer with no tire prying off issues. I suspect he learned the lesson of too little air pressure for his combo.

Would a rim that might have been about 13% wider made a significant difference? WRT how low an air pressure one could run,I don't know if it would make a significant difference. Andy
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Old 02-08-19, 12:45 PM
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BITD Mr Bontrager dumpster dived behind the Specialized warehouse, and brought back a good number of 40 hole 622 Mavic MA2 rims
in his garage shop he cut a section out and rolled them down to 559, and made super light MTB racing wheels ..

Of course the feel of such a bike on loose dirt is quite different from one on pavement..







...

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Old 02-11-19, 10:54 AM
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I am sticking with my 15mm wide Bontager 6700s for now. I have them all cleaned up and a new pair of Gravel Grinder 38s installed.

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