I am someone who lives in a very flat area, not a single hill. Suppose I was taking a road trip and had to go up and down some mountains, what tips should I consider to be safe? How do I avoid ruining my clutch or my breaks?

  • RubberElectrons@lemmy.world
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    1 month ago

    Mountains are always eroding, you’ll find a road that was clear before might have some gravel/sand show up on it the next morning.

  • walter_wiggles@lemmy.nz
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    1 month ago

    In general you won’t need to worry about those things.

    But if you want to worry about them… For the clutch, don’t ride it and don’t leave it in neutral. It’s ok to put it in a lower gear and let the engine do some breaking.

    For breaks, you can alternate front and back if you’re worried about them over heating.

    However, if you just drive normally and don’t speed then you won’t have to even think about these things.

  • BearOfaTime@lemm.ee
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    1 month ago

    Same way you do anywhere else - use them properly (seriously not being snarky, there’s really only one area where there’s a difference, which I discuss below). Keep in mind most bike clutches are wet, so have better cooling capability than cars (though BMW likes a dry clutch).

    Hills aren’t really any different, and with modern vehicles brakes don’t fade like they used to (especially on bikes).

    Though, since a bike does (almost always) have a manual gearbox, let engine braking handle any long downhills where you need to keep speed in check, and use brakes in short, firm decelerations.

    For example, there’s a long downhill on I70 in Colorado, so long it has a sign saying “Truckers You Are Not Down Yet - 7 More Miles of Downhill”. On such a long downhill, downshift just enough that engine braking keeps you at your target speed (say 65 mph on that hill). Then if you do start running fast, or getting too close, use the brakes firmly, not lightly, to quickly bring your speed down.

    This works best because it heats the brakes intensely for a few seconds, but then gives them a relatively long time to cool off afterwards.

    If you were to just lightly hold the brakes to slowly slow down, the discs would heat just as much (if not more), but you’d have less time between braking cycles, leaving less time for them to cool.

    I’ve experienced brake fade on such downhills, it’s no fun (in a truck). Passenger vehicles don’t often have as advanced materials in brakes as bikes do, and this particular one had relatively cheap aftermarket pads, and I had been used to it with factory pads. Big difference.

    I’ve watched trucks going down such hills with their brake discs glowing hot enough to see in daylight - they had to be riding the brakes a long time for that.

    Essentially, any brake system could emergency stop a vehicle at speed on such a downhill one time, so best to keep them cool for as long as possible by using engine braking.

    All that said, on my 35-year-old, 700lb “sport” bike, I’ve never experienced brake fade on downhills like that. The brakes are so oversized relative to the mass of the bike, it’s just not a concern. But I still use engine braking - why take a chance.

    • RubberElectrons@lemmy.world
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      1 month ago

      Good comment, though I need to disagree re: quick braking based on physics principles; moto brakes are designed to handle heat load in most common environments, whether from fast hard braking or long moderate applications.

      Energy cannot be created or destroyed, right? Brakes turn kinetic energy into heat, and that’s a function of clamping force.

      You’re applying less clamping to your brakes over a long period, and rejecting that energy as heat. You’re in fact generating very close to the same net heat with a sharp, fast change in velocity, as between the two options what you’re really affecting is your kinetic energy.

      The difference between the two options is subtle actually, quick steps allow cooling air to access the center of the brake pad between applications, long stop actions don’t. But pads and fluid are now designed to conduct heat well enough to transfer the heat away faster than it can be generated, even if cooling now only affects 5 sides instead of six. That’s the primary and crucial reason why brake fade is no longer common.

      Fast breaking adds potential loss of control into the mix, so it shouldn’t be necessary or recommended.

      • BearOfaTime@lemm.ee
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        1 month ago

        Which is what I said - they have a longer cooling time between braking cycles.

        A longer braking cycle also occurs over a longer distance and time, meaning more time for gravity to continue contributing energy to the equation. A faster deceleration between the same two speeds is less energy dissipation overall (say 70 to 60 over 5 seconds VS 30 seconds). There’s 5 seconds of additional acceleration due to gravity VS 30 seconds more.

        But the biggest thing is you get a long cooling cycle instead of steadily heating the pads and rotors to simply “hold” against gravity. The rotors simply don’t have the mass the absorb and dissipate that steady, continual heat input.

  • tonyn@lemmy.ml
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    1 month ago

    Slow down for the downhill tight turns. Turn your shoulders toward the apex. Don’t be afraid to lean a little more if you have to.

    • BearOfaTime@lemm.ee
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      1 month ago

      Turn your shoulders toward the apex

      Yep, look where you want to go, not where you don’t want to go.

      It’s so weird how our brains work - even after decades on 2 wheels, I sometimes look at what I want to avoid, and, well, I don’t avoid it then.

  • PorradaVFR@lemmy.world
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    1 month ago

    Being used to riding on flat land be aware of sight-lines being obstructed by the hill. “Hug” the fog line (not the centerline) in case oncoming traffic blows the turn an runs wide - this also enables a later apex so optimize your sightline in left handers (for right side traffic, not sure where you live)….also you may not be familiar with turning/elevation changes so take it nice and chill. Enjoy! Having gone from flat FL to mountains in CA it’s how to truly enjoy what your bike can do.