Safe tire clearance?
08-26-20, 09:10 AM
#26
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Crit, you say ?
Criterium races, being lap races around several blocks of city streets, the course will be devoid of huge stones, one may hope..
12-15-23, 01:12 AM
#28
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Minimal distance
Hey fellas.
recently picked up a '13 Scott CR1 Elite. It was in too good shape dang there new. Needing another option besides my SuperSix Evo and I love the classic look of rim brakes.
Anyhow, this machine came stock with 23mm's. My 200lb frame needed a bit more stability so I went with Continental Ultra Sport 3's. I will say I love these tires. Also installed on my Cannondale. But, the Evo had enough room easily to accept these tires and the CR1 I thought it would be similar. Well, there's about 3mm clearance front fork at the base and the same at the rear. It's pretty close but after taking it out it just feels right. My only concern is if I had something go wrong and the wheels go out of true. But if that happens I'd still have a problem anyhow and need replacement.
My biggest curiosity is if there's any long distance hindrance or benefits? If there's anyone with experience on this tech option I'd like to know all about it. No one has really mentioned any performance or holdbacks so I'm all ears everyone!
Thanks
recently picked up a '13 Scott CR1 Elite. It was in too good shape dang there new. Needing another option besides my SuperSix Evo and I love the classic look of rim brakes.
Anyhow, this machine came stock with 23mm's. My 200lb frame needed a bit more stability so I went with Continental Ultra Sport 3's. I will say I love these tires. Also installed on my Cannondale. But, the Evo had enough room easily to accept these tires and the CR1 I thought it would be similar. Well, there's about 3mm clearance front fork at the base and the same at the rear. It's pretty close but after taking it out it just feels right. My only concern is if I had something go wrong and the wheels go out of true. But if that happens I'd still have a problem anyhow and need replacement.
My biggest curiosity is if there's any long distance hindrance or benefits? If there's anyone with experience on this tech option I'd like to know all about it. No one has really mentioned any performance or holdbacks so I'm all ears everyone!
Thanks
12-15-23, 07:54 AM
#29
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I think this is a bit of hyperbole. Any "rock" (assuming anything could even be picked up by those nearly-slick tires), would probably be knocked off by the fork before any kind of "lock up" occurred.
12-15-23, 09:04 AM
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Fresh laid asphalt (pothole patching) or fresh chip and seal are the two road conditions that come to mind that are well known for allowing the road's bits to cling to even a smooth tire. Andy
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12-15-23, 09:19 AM
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I, personally, doubt anything clinging to the tire due to stickiness would lock up the front wheel. YMMV.
12-15-23, 02:27 PM
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Even if a pebble does stick to the tire, if it is small enough to get wedged in there (rather than just hetting knocked of) there is a bit of give in the tire itself to accommodate it. It just needs to get past the brake arch.
12-16-23, 07:52 AM
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Early on I was a design engineer and had to work inside ISO, the many 1,000s of standards guidelines derived by consensus of worldwide subject matter experts for safety and quality in products. The ISO standard for forks being 4mm tire clearance is one of these and while I might fudge a little on my bikes I would never on my families or anyone else's bike. We had an old often used saying "safety standards are written in blood".
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12-16-23, 09:36 AM
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Well, there's about 3mm clearance front fork at the base and the same at the rear. It's pretty close but after taking it out it just feels right. My only concern is if I had something go wrong and the wheels go out of true. But if that happens I'd still have a problem anyhow and need replacement.
12-17-23, 08:33 AM
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12-17-23, 08:37 AM
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12-17-23, 09:00 AM
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12-17-23, 01:53 PM
#38
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I've similar front clearance on one of my bikes. The brake caliper is closer than the fork crown and 'gravel' can get caught (wedged) in the caliper and rub on the tyre. Usually stopping and reversing the wheel rotation shifts it but I have had to loosen the wheel on occasion. No issues with the fork crown and wheel has never locked.
12-17-23, 03:01 PM
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Yup I've had a pebble get caught in my tire tread and then hit the bottom of the brake caliper. Made an awful sound and locked up the wheel completely (this was on the rear). Removed it and kept riding, but did switch to a narrower tire afterwards.
12-18-23, 05:36 AM
#40
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That's too narrow for my comfort. Anything that sticks to the tire could potentially lock it.
12-19-23, 02:34 AM
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I was running clearance like that on a 25mm tyre, I think the bike must have come with 23s. Never had an issue until a small bulge started rubbing on the caliper and eventually burst. It was a safe but fast and loud deflation. I don’t know if the bulge was caused by something else being squeezed in there at some point or just usual wear and tear.
