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Simon E.
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July 8, 2015 at 10:05 am #24392
Lee170
I’ve just bought a new bike and have been out a few times on it, it’s ace so far.
I’m around 70kg and ride a 25c tyre, what pressures should I be running front and rear,
I am going out today to buy a gauge track pump as my current pump has no gauge. -
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hsiaolc
Since you are only 70 kg you
Since you are only 70 kg you can have the luxury to run at much lower psi so you can have the ride comfort. I used to ride 120psi on 23mm tyres but now I run at 28 on 85 psi and I love it.I wish I knew sooner I can ride at much lower psi.
fukawitribe
ianrobo wrote:I have 25mm and
ianrobo wrote:I have 25mm and my pressure is at 125 normally, 90kg in weight but seems way higher than what is said hereWellllll, it does seem pretty high even given the weight, but if you’re OK with it then it’s clearly not an ‘issue’. That said, you could always try dropping 10-20-30psi and see if you like it, nothing much to lose.
crikey
What is abundantly clear is
What is abundantly clear is that the modern bicycle geek spends far to much time arsing about with tyre pressures…80-100 psi will be fine for just about any application using 23/25s.
That’s all you need to know.
(…and I know from buying pints for one of the backroom boys from British Cycling that one of their marginal gains involved making and calibrating digital pressure gauges because the gauges on shop bought track pumps where anything from 10 to 30 psi out…)
BBB
700c wrote:BBB wrote:
With700c wrote:BBB wrote:
With narrow tyres, higher pressure won’t make you faster, just less comfortable.Why? I don’t get it. Are you saying that running higher pressures on wider tyres will make you faster? or remain as comfortable as at lower pressures? but that this isn’t the case with narrow tyres? Also what is the definition of ‘narrow’ and ‘wide’ in mm to get to the sweet spot of the tyre pressure-comfort-speed relationship?
Granted, I’m being slightly facetious, and I get that there is a trend towards wider tyres for UK roads which have some inherent benefits for many.. but I don’t think the science is saying ‘go as wide as you can to be fast and comfortable’, or at least it’s not a simple case of ‘wider is better’ as people like to make out..
There’s evidence that at least in case of racing tyres, on smooth tarmac, pressure make almost no difference to speed. Logically it’ll make one faster on rougher surfaces due to reduced “suspension losses” (vibrations and up and down movement of the rider’s body).
Pneumatic tyres were invented as suspension not to emulate solid wheels. The only possible reason for putting around 100PSI in bicycle tyres is to prevents pinch flats (in which case the tyre is too narrow for a given rider).
Personally I wouldn’t ride any setup that would force me to run over 60-70 PSI.
ianrobo
I have 25mm and my pressure
I have 25mm and my pressure is at 125 normally, 90kg in weight but seems way higher than what is said hereSimon E
Minimum pressure is only a
Minimum pressure is only a guideline/legal arse-covering measure that IIRC has only appeared in recent years. I have often ridden 25mm tyres at 40-50 psi with no problem (though it is not ideal). I consider the 85 psi minimum stated on a 25mm Durano to be the highest pressure I would use for regular riding, 70 psi feels considerably better. For racing the Ultremos are at 90-100 psi.fukawitribe wrote:ibr17xvii
fukawitribe wrote:ibr17xvii wrote:OP, what track pump did you go for?Looking to get one with a gauge on myself.
Sorry to butt in, but Evans have the Birzman Maha really rather cheap, e.g. the IV is about 24 quid
http://www.evanscycles.com/products/birzman/zacoo-maha-iv-track-pump-ec050466
They seem to get universally excellent reviews
http://road.cc/content/review/84544-birzman-zacoo-maha-iii
http://www.cyclingweekly.co.uk/reviews/pumps-puncture-repair/birzman-zacoo-maha-iii-track-pump-49-99
http://www.bikeradar.com/road/gear/article/best-floor-pumps-for-road-cyclists-33412/Even tempted to replace my Blackburn for the head alone…
Ive just ordered the green one, they look ace. Reviews are excellent to. Thanks for the link/help/tip off
700c
BBB wrote:
With narrow tyres,BBB wrote:
With narrow tyres, higher pressure won’t make you faster, just less comfortable.Why? I don’t get it. Are you saying that running higher pressures on wider tyres will make you faster? or remain as comfortable as at lower pressures? but that this isn’t the case with narrow tyres? Also what is the definition of ‘narrow’ and ‘wide’ in mm to get to the sweet spot of the tyre pressure-comfort-speed relationship?
Granted, I’m being slightly facetious, and I get that there is a trend towards wider tyres for UK roads which have some inherent benefits for many.. but I don’t think the science is saying ‘go as wide as you can to be fast and comfortable’, or at least it’s not a simple case of ‘wider is better’ as people like to make out..
BBB wrote:Start at 100PSI and
BBB wrote:Start at 100PSI and then try dropping it. If after several rides you don’t suffer pinch flats/rim strikes and handling issues, drop it even more and keep dropping it.A few things to remember:
Ignore manufacturer’s recommendations.
Ignore what other people run (most of them run their tyres too hard).
With narrow tyres, higher pressure won’t make you faster, just less comfortable.
Front tyre carries less weight so it needs fewer PSI.Ah yes, ignore manufacturer’s recommendations but trust the advice received on an internet forum! 😉
Joking aside, I would agree with the above in so much as you shouldn’t take any notice of the pressures other people run – it will depend on road surfaces, weather, rider weight, type of tyre, personal comfort requirements etc.
It won’t help you to know, for example, that I will run up to 140 psi on the rear when I’m on a route with smooth roads!
Start at 100PSI and then try
Start at 100PSI and then try dropping it. If after several rides you don’t suffer pinch flats/rim strikes and handling issues, drop it even more and keep dropping it.A few things to remember:
Ignore manufacturer’s recommendations.
Ignore what other people run (most of them run their tyres too hard).
With narrow tyres, higher pressure won’t make you faster, just less comfortable.
Front tyre carries less weight so it needs fewer PSI.fukawitribe
Batchy wrote:fukawitribe
Batchy wrote:fukawitribe wrote:Batchy wrote:ibr17xvii wrote:OP, what track pump did you go for?Looking to get one with a gauge on myself.
I’ve just lashed out all of £5.99 for an Aldi track pump. To be honest I doubt whether there is anything out there that comes close to this item for value. It is a super pump with gauge and it is very solidly built considering the price. Check one out you will be amazed.Hope it lasts longer than the ones they’ve had before..
Yes! This latest version is a completely different beast comparerd to Aldi ‘s previous pumps. It has a metal barrel and foot plate and the pump action is as smooth as silk ! You really need to check this out seriously !If I didn’t have a decent one already, i’d be interested in at least seeing what it was like. However I do, and the one thing that drives me mad with most pumps is the valve head – nothing comes close to the Birzman snap-it head IMO – so that’s where my money will probably be going next time. Twenty-odd quid would be a bloody good deal for the ease and precision every time I pump up tyres but my Blackburn works so well apart from that wee irritation it seems a bit silly to go there now. Good luck with it, be curious to hear how it goes as a recommendation for others.
Batchy
fukawitribe wrote:Batchy
fukawitribe wrote:Batchy wrote:ibr17xvii wrote:OP, what track pump did you go for?Looking to get one with a gauge on myself.
I’ve just lashed out all of £5.99 for an Aldi track pump. To be honest I doubt whether there is anything out there that comes close to this item for value. It is a super pump with gauge and it is very solidly built considering the price. Check one out you will be amazed.Hope it lasts longer than the ones they’ve had before..
Yes! This latest version is a completely different beast comparerd to Aldi ‘s previous pumps. It has a metal barrel and foot plate and the pump action is as smooth as silk ! You really need to check this out seriously !fukawitribe
Batchy wrote:ibr17xvii
Batchy wrote:ibr17xvii wrote:OP, what track pump did you go for?Looking to get one with a gauge on myself.
I’ve just lashed out all of £5.99 for an Aldi track pump. To be honest I doubt whether there is anything out there that comes close to this item for value. It is a super pump with gauge and it is very solidly built considering the price. Check one out you will be amazed.Hope it lasts longer than the ones they’ve had before..
kwi
paulfg42 wrote:Why more
paulfg42 wrote:Why more pressure in the rear than in the front? Would this apply to any kind of bike?
More weight on the back wheel.paulfg42
Why more pressure in the rear
Why more pressure in the rear than in the front? Would this apply to any kind of bike? -
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