pressure sensors

First.Aspect

davebradswmb wrote:

First Aspect wrote:

I see you have taken up cycling recently, and read a lot about carbon clinchers. Without understanding it.

Why so rude? And so wrong at the same time? You still haven't explained yourself. Why did your tyre blow out? Simple question, can you try answering it? And then we may understand why the pressure sensor wouldn't have helped.

My tyre didn't blow out. The issue with carbon clinchers and blow outs is temperature, not pressure. Or, put another way, whether your tubes and/or rims are any longer capable of retaining more or less the pressure you put in before you started to descent the Alpe.

I suppose hypothetically that your app could tell you about a pressure rise correlating that the carbon, or one or more spots of the tube near the brake track is getting too hot, but it would be a coarse, time delayed and indirect measurement and not terribly sensitive, Boyle's Law being in Kelvin and all that, and carbon fibre and rubber being quite good insulators. And how would the app know what the tube/tyre/rim combination can handle anyway, or whether the wheel is true and whether you are generating hot spots?

Absolutely a £200 sensor and app, on the phone you would need to mount on your bars, would tell you about slower punctures, but most of us can tell if the tyres are down from, say, 90 to 70 psi. So does the app increase safety there either?

Sorry, but it is like having a gadget to tell you the current weather where you are now.

Probably more useful for bikes with suspension? I don't know but I imagine its much harder to tell if you have a flat on a full sus mtb, and this gadget might help reduce the damage you do to your wheels. Surely that's the target market, not roadies. Again, I don't mountain bike often, but don't you need to select tyres and pressures according to the conditions? Isn't it hard to let out, or put in, just the right amount of air? Again, I could see it being useful there.

First.Aspect

ugo.santalucia wrote:

Most people seem to obsess about their heart rate, while they are sitting on a blubber pumped at 100 PSI... :roll:

Did you mean bladder, or do you think my bum looks big in this?


I agree safety is more important than kit manufacturers normally allow - the weight and venting of a cycle helmet being more important for years than whether it actually works, for example. Its just that this particular gadget doesn't, in my view, significantly improve safety.

chippyk

joey54321 wrote:

cgfw201 wrote:

£200! Having done over 100,000km without having a puncture I've not been able to slow down and stop from in a safe way, this seems totally over the top for solving a problem which doesn't really exist.

Are you on tractor tyres or something? 100,000km is an insane distance to not have a puncture over!

I've actually been convinced, at £20 i'd likely call it good value and buy one/two.

I think s/he doesn’t mean 100,000km without a puncture, but without having a catastrophic puncture that they have been unable to stop safely from. They haven’t had a blowout at 50mph that’s thrown them off the bike.

shortfall

I don't have any skin in this particular game, but playing Devil's advocate, those of you who think these are a good idea to warn against a catastrophic high speed tyre failure but are waiting for the price to drop to 20 quid are effectively valuing your own life and well being at £180.

Matthewfalle

seriously?

this is now unnecessary tech gone mad

#ridiculous

ugo.santalucia

Shortfall wrote:

I don't have any skin in this particular game, but playing Devil's advocate, those of you who think these are a good idea to warn against a catastrophic high speed tyre failure but are waiting for the price to drop to 20 quid are effectively valuing your own life and well being at £180.

Just being realistic... the same device for a car tyre costs £ 20, so there is an expectation that these will drop in price. Why pay 200 if you have lived without them until now?
20? Maybe, why not...

ugo.santalucia

Matthewfalle wrote:

seriously?

this is now unnecessary tech gone mad

#ridiculous

whereas 12 sprockets... :roll:

shortfall

ugo.santalucia wrote:

Shortfall wrote:

I don't have any skin in this particular game, but playing Devil's advocate, those of you who think these are a good idea to warn against a catastrophic high speed tyre failure but are waiting for the price to drop to 20 quid are effectively valuing your own life and well being at £180.

Just being realistic... the same device for a car tyre costs £ 20, so there is an expectation that these will drop in price. Why pay 200 if you have lived without them until now?
20? Maybe, why not...

Well they might come down (a bit) but there's no correlation between the cost of consumables between cycling and motoring and we take it for granted that we're going to be gouged for everything in the 2 wheel world. My point still stands. If you're pushing these on the grounds of safety and the fact that they might protect you from a sudden and catastrophic tyre failure at high speed then what price do you put on that?

svetty

I wonder how much it weighs? Having a weight at one point on a light road rim might cause vibration/pulsing at speed - no?

ugo.santalucia

Shortfall wrote:

My point still stands. If you're pushing these on the grounds of safety and the fact that they might protect you from a sudden and catastrophic tyre failure at high speed then what price do you put on that?

You put a price on everything... including safety... if I can't afford it, I'll have to live without it. IN my case, I don't even have a GPS which is ANT+ compatible, so it would be a non starter... I am waiting for those to come down in price too, although I don't see it happening

ugo.santalucia

Svetty wrote:

I wonder how much it weighs? Having a weight at one point on a light road rim might cause vibration/pulsing at speed - no?

I'd be surprised if they were more than a handful of grams

Matthewfalle

ugo.santalucia wrote:

Matthewfalle wrote:

seriously?

this is now unnecessary tech gone mad

#ridiculous

whereas 12 sprockets... :roll:

i've never defended 12 sprockets.

i've never defended 11 sprockets.

in fact i seem to be one of the few who still stand up for mechanical

these tire things are utterly unnecessary

#pointless

ugo.santalucia

Matthewfalle wrote:

ugo.santalucia wrote:

Matthewfalle wrote:

seriously?

this is now unnecessary tech gone mad

#ridiculous

whereas 12 sprockets... :roll:

i've never defended 12 sprockets.

i've never defended 11 sprockets.

in fact i seem to be one of the few who still stand up for mechanical

these tire things are utterly unnecessary

#pointless

Where would you like to see innovation? There needs to be innovation or nobody will buy bikes anymore

Matthewfalle

innovation is not tire pressure things. that is a gimmick for a)mechanical luddites b) people who neeeeeeeed a gadget 'cos 'cos 'cos

innovation in materials, lighter stronger steel frames, progression on efficiency AND affordabiluty of groupsets, bearings, etc.

thats innovation, not a pressure gauge that looks like its from your local garage or a 15th gear on your electronic groupset that you neeeed because the bloke at the shop told you you did.

ugo.santalucia

Matthewfalle wrote:

innovation is not tire pressure things. that is a gimmick for a)mechanical luddites b) people who neeeeeeeed a gadget 'cos 'cos 'cos

innovation in materials, lighter stronger steel frames, progression on efficiency AND affordabiluty of groupsets, bearings, etc.

thats innovation, not a pressure gauge that looks like its from your local garage or a 15th gear on your electronic groupset that you neeeed because the bloke at the shop told you you did.

I don't think there has been much innovation in steel over the past few decades.
A 1980 frame my size in Columbus SL was about 1600 grams, the latest state of the art Columbus stainless is probably 1300 grams. 40 years to shave 300 grams doesn't seem worth the bother.
As for strength, the former is still there, so not sure how much stronger it needs to be.

You can replace your bearings with the highest quality you can find and will make xxxxall difference to their durability of friction coefficient...

Groupsets, it is widely acknowledged that Dura Ace 7800 was better than anything that came after, the same is true for Campagnolo Record/Chrous 10 speed

I would argue that your innovation is a waste of time

Matthewfalle

I would state that these tire pressure things are shyyte

imposter2.0

ugo.santalucia wrote:

There needs to be innovation or nobody will buy bikes anymore

I'm still buying bikes - and I couldn't give a fck about innovation...

Matthewfalle

Imposter wrote:

ugo.santalucia wrote:

There needs to be innovation or nobody will buy bikes anymore

I'm still buying bikes - and I couldn't give a fck about innovation...

This.

Matthewfalle

The only innovation I want is to innovate a Formigli Uriel into my life.

#properbike

davep1

ugo.santalucia wrote:

DaveP1 wrote:

My car has them, although I don't think they are that great. The pressure should be 37 psi but the low pressure warning didn't sound until 22 psi. If they are to be safe, surely they need to be more accurate/resposnive than that?

22 PSI for a car tyre is still well within safety.

Possibly but it is about half what it should have been. If your bike tyre was down to 50 psi before your pressure monitor flagged it up, would that be much use? In my experience bike punctures are pretty quick, not many of them take miles and miles to get worse.