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19 votes

The tire of my bicycle flattens within a week

Not an uncommon kind of puncture. A very small hole in the tube can take weeks before the tire becomes flat. It can also be caused by a leaking valve. Use soapy water to wet the valve and look for a ...
mattnz's user avatar
  • 50.9k
13 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

There are three aspects to it: Rated max pressure doesn't necessarily have much to do with how much pressure the tyre can really withstand safely. All ratings on products are at least a bit below ...
leftaroundabout's user avatar
11 votes

Towing children and rear tire

The fact that you were towing a trailer should not have had any influence on your tire going flat. Quite surely it was either some sharp or pointy object that the tire picked up on the road or ...
Benedikt Bauer's user avatar
11 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

Of course it would be possible to build mountain bike tyres that could take the same sort of pressure as road bike tyres. But they'd be very heavy, expensive (with all the extra material in them) and ...
Chris H's user avatar
  • 59.7k
9 votes

What are the drawbacks of having wider tires on endurance road bikes, as they may offer the same rolling resistance with lower pressure/more comfort?

Short and simple it’s a combination of aerodynamics, weight and perception/history. The wider the tyre (and the frame which fits the tyre) the more aerodynamic drag you are going to have. Weight also ...
Michael's user avatar
  • 27.8k
8 votes
Accepted

Does low tire pressure affect safe, minimum tire clearance?

By "clearance" I assume you mean distance between the tire and frame members. If you run a tire at low pressure, that only affects the tire's shape where it contacts the ground. It won't ...
Adam Rice's user avatar
  • 30.1k
8 votes

Tire flat after 2nd trip on Brand New Ancheer 500W Ebike

Based on this... https://www.amazon.com/ANCHEER-Electric-Commuter-Removable-Professional/dp/B0BFQZHVZH?th=1 The correct tire pressure for riding on the road is probably somewhere around 30-40PSI. Too ...
mattnz's user avatar
  • 50.9k
6 votes
Accepted

What are the drawbacks of having wider tires on endurance road bikes, as they may offer the same rolling resistance with lower pressure/more comfort?

There's no substantive disadvantage in many situations. Each wheel can accommodate a range of tire sizes to achieve good aerodynamic drag figures. If you run tires too big, this will disrupt the ...
Weiwen Ng's user avatar
  • 32.5k
6 votes

The tire of my bicycle flattens within a week

It's either a slow leak or a loose valve core. Slow leaks are notoriously difficult to find. Do note that high-pressure bike tires anyway need pumping up once every two weeks since the pressure drops ...
juhist's user avatar
  • 19k
5 votes

The tire of my bicycle flattens within a week

If it keeps happening after you've installed a known good inner tube, make sure that your installation procedure is correct (you're not damaging the inner tube when you're installing it), and the tire ...
alecail's user avatar
  • 230
5 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

Another consideration is the rim that these tires are mounted on. With modern double-wall rims, the outer wall needs to withstand the tire pressure. Considering that most MTBs are using less than ...
MaplePanda's user avatar
  • 15.6k
5 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

Here are some rough numbers to illustrate the forces involved with larger tires at higher pressures, using imperial measurements (inches, PSI, etc). Just so you can get an idea of the magnitude of the ...
Andrew Henle's user avatar
  • 10.6k
5 votes

What happens if a tubeless tyre is overinflated?

Even with tubes, the tyre is what withstands the force. Tubeless of course has some unique failure modes but there will also be common ones. A dodgy pressure gauge meant I put what I later worked out ...
Chris H's user avatar
  • 59.7k
5 votes

Does low tire pressure affect safe, minimum tire clearance?

For the most part it doesn't matter because at the spots where the tire is passing close to the frame/fork, it's unloaded by anything but air pressure and will be dimensionally very close regardless ...
Nathan Knutson's user avatar
3 votes

What are the drawbacks of having wider tires on endurance road bikes, as they may offer the same rolling resistance with lower pressure/more comfort?

The two drawbacks have already been mentioned: aerodynamics and weight. However, there's a third drawback. It's the fact that bicycles have their ground clearance set by tire size. So the frame ...
juhist's user avatar
  • 19k
3 votes

Can I change my 29x2.25 MTB tyres to a 29x2.35 tyre without changing anything else?

Yes, most likely you should be able to go from 2.25 to 2.35 with no issues IF the frame/fork can accommodate wider tires. You need some clearance at rest since the tire deforms now and then when ...
WornChain's user avatar
  • 1,569
2 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

My understanding is that tire pressure correlates directly to contact area. Contact force from the tire must exactly counteract the weight. A tire having no weight on it is curved, with near zero ...
Thomas W's user avatar
  • 121
2 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

You don’t want to ride a MTB tyre at road bike tyre pressures. The recommended or maximum pressure on most tyres is usually much higher than you’d ever want to ride for optimum comfort and rolling ...
Michael's user avatar
  • 27.8k
2 votes

Why are mountain bike tires rated for so much lower pressure than road bikes?

I'd be riding the mountain bike in the city on flat roads, just like a road bike. you are using the bike where it is not purposefully designed to go. That aside, a lower tire pressure: allows the ...
L.Dutch's user avatar
  • 7,131
2 votes

What happens if a tubeless tyre is overinflated?

The exact same things may happen as when you overinflate a tubed tire: If the rim's side wall is weak (too much rim braking), the side wall may fail by bending outwards, releasing the tire's bead ...
cmaster - reinstate monica's user avatar
2 votes

Towing children and rear tire

The nose weight of the trailer should be no more than a couple of moderate panniers or a fairly heavy backpack. Not worth extra pressure but worth making sure your tyres aren't really soft to start ...
Chris H's user avatar
  • 59.7k
1 vote

What are the drawbacks of having wider tires on endurance road bikes, as they may offer the same rolling resistance with lower pressure/more comfort?

The main drawback is that their max pressure rating goes down as the tire gets wider. There simply is no such thing as "wider tires […] offer less rolling resistance for the same pressure". ...
cmaster - reinstate monica's user avatar
1 vote

Can I change my 29x2.25 MTB tyres to a 29x2.35 tyre without changing anything else?

Nothing else to change, provided there's enough clearance (space between the tire and the frame/accessories - tire deformation is mostly at the interface tire/road, so I wouldn't worry about that). ...
Rеnаud's user avatar
  • 20.6k
1 vote

What happens if a tubeless tyre is overinflated?

With tubeless tires, I think you shouldn't need to overinflate them to seat them. What counts is the blast of air into the chamber. With wider tires, there is another potential reason. The larger the ...
Weiwen Ng's user avatar
  • 32.5k
1 vote

Why are mountain bike tires rated for so much lower pressure than road bikes?

Adding to the answer from L.Dutch. Wider/high volume tires will generally provide a firmer road/trail feel at lower pressures. 40 PSI in a MTB tire will feel show minimal deflection, while 40 PSI in a ...
Jason S's user avatar
  • 11

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