Do you agree with this tyre pressure calculator?

by 33

Goodyear have some new tyres out – the Newton MTF and the Newton MTR. They’ve also got a new online tyre pressure assistant. From our preliminary messings about, it seems pretty useful.

(Here for tyre calculator? Scroll down a bit)

Goodyear are having another crack at er, cracking the mountain bike tyre market. They first dabbled with mountain bikes tyres in 2018 but they never really good much traction (pardon the pun).

Goodyear Newton MTF

The new Goodyear Newton MTF and MTR tyres launched this week appear to be something of a simpler range of rubbers.

For a start they’re focussing on tyres for harder hitting duties. Whether that is gravity/enduro bods or simple ebike-worthy tyres, there is nothing for XC duties in this relaunch.

Knobs

The Newton MTF is a rounder profile, more gappy knobbled tyre, nominally intended for front wheel use. With its really spaced out shoulder tread, it doesn’t really resemble any other tyre out there (that we can think of anyway).

Of particular note is Goodyear’s highlighting of the damping properties of the round-profile Newton MTF. “By utilizing a rounder profile for the Newton MTF, damping capacity is increased and the tire footprint is elongated; in the real world, this offers improved straight-line control while providing a greater contact patch for braking.”

Goodyear Newton MTR

The Newton MTR is a squarer profile tyre, nominally intended for rear use. The Newton MTR bears a familiar central-paddle and blocky-shoulder tread pattern common to other brands.

No particular damping claims for the Newton MTR. Just that “The [Newton MTR’s] wider footprint offers greater drive traction and confidence inspiring transition between center tread to side knobs.”

Rubbers

The Newton MTF is available in two rubber compounds: Trail2 and Grup3S.

The Newton MTR is available in two rubber compounds: Trail 2 and Grip3.

Trail2 = 50/60a

Grip 3S = 40/42/60a

Grip 3 = 40/50/60a

It’s these rubber compounds that hold most interest to us tyre geeks. Previous Goodyear mountain bike tyres never really seemed to get the formula quite right. The softer compounds were okay but the firmer compounds were felt to be a bit skittish on loose and/or wet terrain.

These new tyres have been developed in conjunction with Rubber Kinetics. These are the folk behind the excellent soles on Ride Concepts’ riding shoes.

Casings

Both tyres are available in three casing options: Trail, Enduro, Downhill. Nice and simple.

Trail = 1 x 60TPI with bead-to-bead anti-cut layer

Enduro = 2 x 120TPI with butyl sidewall support

Downhill = 2 x 60TPI with thicker butyl sidewall support

How much?

Trail Casing £54

Enduro Casing £60

DH casing £65

Tyre pressure calculator

Developed in conjunction with SRAM, there’s also a new online tyre pressure calculator from Goodyear.

Although it’s squarely aimed at Goodyear tyres (you have to select a Goodyear tyre from the dropdown menu to get a ‘result’) we reckon it can be used as a general assistant for all brands of tyre. You just need to select the Goodyear casing equivalent of your tyres’ casings.

It’s certainly seems to tally with how we set up our tyres. And it could be useful for everyone who’s wondered just how much they should alter their tyre pressures depending on ground conditions, casing types, overall rider-plus-kit weight and other factors.

Letting a couple of PSI out of your tyres (23.6 to 21.1) for when it’s wet out there seems like eminently sensible advice, for example.

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Viewing 33 posts - 1 through 33 (of 33 total)
  • Do you agree with this tyre pressure calculator?
  • momo
    Full Member

    The pressure calculator is just the SRAM one relabelled and made worse by needing to select a Goodyear tyre from the list.

    jordan
    Full Member

    Pretty much spot on with my current pressures.

    DB
    Full Member

    Pretty much bang on for me, if you can trust the gauge on my track pump but that’s a whole other conversation 😉

    kelvin
    Full Member

    Thanks momo.

    What do the “rim type” options mean?

    DickBarton
    Full Member

    Ouch…I’m about 10psi too low on my front and about 13psi too low on the rear with that Sram guide…however, end of the day, if it feels ok then it likely is.

    Ian Jones
    Full Member

    Tyre pressures to 1/10 psi? Really?

    BigBlackShed
    Full Member

    Recommend tyre pressures from the calculator are double what I run.

    tjagain
    Full Member

    About right for me which means they will be too hard for many on here.

    BruceWee
    Full Member

    Spot on for the pressures I was running 15 years ago.

    a11y
    Full Member

    Far too hard for me. Recommended 28.5/31.5psi front/rear for me as for a 29×2.3 trail tyre on 26mm internal rims, 88kg rider. I ride with 22/25psi front/rear and a couple of psi less in the wet.

    Ben Haworth
    Full Member

    Interesting. It does seem to really up the pressures a bit far when you up the rider weight dunnit?

    Yak
    Full Member

    Seems a couple of psi higher than my normal. Probably means I am not riding hard/fast enough.

    Neal Taylor
    Full Member

    Pretty close on the rear, touch high for the front. I’d run less at a trail centre though, but these suit the pointy rocks in the lake district.

    Van Halen
    Full Member

    seems about right for me. not that any of my pump guages work! i prefer it harder.

    el_boufador
    Full Member

    About right for the rear (pinch flat avoidance, even with an insert)

    5-6psi too high for the front

    timba
    Free Member

    The new Goodyear Newton MTF and MTR tyres launched this week appear to be something of a simpler range of rubbers.

    How many rubbers make it a GoodYear?

    chrismac
    Full Member

    It’s reasonably close. If I select wet then they are about 4 PSI higher than I run at both ends

    andrewh
    Free Member

    I run about 12psi more than that.
    Does it just assume I’m tubeless?

    reluctantjumper
    Full Member

    Both front and rear pressures are 8psi above what I run, that’s a 30% increase!

    Tyre pressures to 1/10 psi? Really?

    My digi gauge goes to 1/10th so the nerd in me means I adjust them to be 21.0, not 21.1 or 20.9. Sad but true.

    johnhe
    Full Member

    The SRAM one is about 10 psi above where I run my tyres.

    bowglie
    Full Member

    hmmm, it recommends pressures about 20 to 25 percent higher than I typically use.

    BruceWee
    Full Member

    Maybe we all decided on our tyre pressures based on our pre-lockdown weight?

    malv173
    Full Member

    My only problem with that sram calculator is not knowing how much my bike weighs.

    On the lower of two guesses (13.5kg and 14kg) it is pretty much spot on.

    Mark
    Full Member

    Any feedback on the actual tyres?

    Shortage of my usual Maxxis DD Assegai/DHR forcing me to shop around.

    cheers_drive
    Full Member

    me 103k
    gravel bike, F43c 30psi, R38c 40psi. The calc says 41/52
    Hardtail, F2.6″ 20psi, R2.5″ 30psi. Calc 27.1/27.5
    Road bike (tubed), F28c 85psi, R25c 95PSI. Calc 80/99

    Not to bad apart from the Gravel bike which is well out.

    reeksy
    Full Member

    Pretty similar to what I run on the rear. Any lower is pinch flat risk
    Front is maybe a couple psi higher than I use… though I don’t monitor it that much.

    Mark Gorman
    Full Member

    The SRAM one is a touch higher on the front but about right on the rear

    n0b0dy0ftheg0at
    Free Member

    Little point comparing as I’ve never ran a Goodyear tyre and the degree of lying between marketing width and planet reality varies between brands and even between models in a brand. It can even vary between different widths of same model!

    I run 23mm GP5000 (that sizes big) @ 95PSI on front and 32mm GP5000 (that sizes small) @ 80PSI on the road bike.

    On the commuter, I run 35mm Marathon Supreme (sizes small) @ 60PSI on front and 40mm Marathon Supreme (sizes small) @ 70PSI on rear.

    stars_1
    Free Member

    Yes, have been pretty knowledgeable in this field for quite some time and this is very much correct. Wouldn’t have been able to present it more clearly

    b33k34
    Full Member

    Tyre pressures are about spot on for what I ride, if I take the Trail/Enduro (which seem the same) as what I run when it’s really rocky and the XC as what I run for UK riding in the woods.

    I run higher pressures than some, but no inserts.

    (pretty sure the SRAM standard/reinforced/DH has just been mapped across the the Good Year tyres) It’s also pretty close to the Stans model that was doing the rounds a year or two ago. Makes a lot of sense that combined lighter bike and rider would run lower pressures and the differemnce in bike weight is pretty small – The 4-5 kg weight between my Orbea Rise and my enduro bike only increases the pressure by about .5psi.

    wordnumb
    Free Member

    Nope.

    Martin B
    Full Member

    Both SRAM & Goodyear Calculators are well above what I would run even on the hardtail, when I run them higher for more speed & less techy terrain.

    P-Jay
    Free Member

    Calculator says 28 front, 30 rear, I’ve been running 20 front, 30 rear for a few years now.

    Off the back of this, I decided to trial 24 front, 30 rear this weekend, conditions were bone dry, loose powdery ‘mud’ lots of loose rocks over a rocky trail with a few roots (Cafal followed by Twrch at Cwmcarn). Results were positive, didn’t feel any rougher on the small bump stuff, which has been the problem in the past, turn in was a bit more positive and bit into the turns about as well as you’d hope given how powdery it was that day.

    I might try 28fr next weekend.

Viewing 33 posts - 1 through 33 (of 33 total)

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