Dang, 32c tires are slow
Is it the weight or the rolling resistance?
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You need to pedal faster
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lol it's both
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Originally Posted by adlai
(Post 21430335)
Is it the weight or the rolling resistance?
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Originally Posted by Ross520
(Post 21430461)
32mm tires have less rolling resistance than 25s or 28s, however, they are heavier, and less aerodynamic, so in the real-word, they're slower.
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Originally Posted by SethAZ
(Post 21430505)
My 32mm tires are barely heavier than a GP5K 28mm. I can't argue the aero thing. I don't think I lost any speed going to them. They are uncommonly good 32mm tires, though, not cheap, heavy, and stiff.
I, personally, don't have the opinion that 32s are "slow", just that in good surfaces a 28, or 25 would be a little quicker. I've noticed that OP has some, uh, interesting takes on various topics. |
Originally Posted by Ross520
(Post 21430461)
32mm tires have less rolling resistance than 25s or 28s, however, they are heavier, and less aerodynamic, so in the real-word, they're slower.
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Originally Posted by subgrade
(Post 21430557)
Does really a 4-7 mm change in tire width make a real difference in aerodynamic drag unless the rest of the bike+rider is as aero as it gets? (I doubt that can be said about any rider who isn't attempting a world record)
And when you factor-in the decrease in weight and rolling resistance, a 25 or 28 will likely be noticeably faster, as long as the surface is smooth.Whereas a 32 will shine on rough surfaces. It really depends on where you ride. If your routes are silky smooth, it would make no sense to run the larger tire, and vice-versa for a rough surface. |
Throw away the speedometer. Life is not a race unless your in a race. Just enjoy the ride
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I'm curious about what metric you used to determine your loss of speed. A few years ago I did a comparison between 2 bikes on which I commuted to work. One was a 33 pounder with 32mm heavy tires and the other was a vintage steel light weight road bike with 25 mm light tires. Over the course of a few months of recording I saw no significant difference in average speed between the two bikes even thoughthe heavy bike felt slow in comparison. The effect of rolling resistance is much dependent on road surface but any advantage of an easier rolling tire quickly disappears as you go faster and wind resistance grows. Lighter tires certainly accelerate faster; however once up to speed the advantage may go to the heavier tire because it maintains momentum longer.
Tires always come with trade-offs. It's really up to you to determine what qualities (objective or subjective) are important to you. |
Are you airing them up to the max? If you are, trying running them a little lower, maybe 10-15psi lower, should be faster than running the max.
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Gee..here's a topic that hasn't been flogged to death in the last day or so...though flogged endlessly, countless times before.
Gotta call "troll" on this one. |
Originally Posted by Ross520
(Post 21430615)
I’m not sure what that would have to do with the tires. The improvement should be the same regardless of the aerodynamics of the rider and rest of the bike.
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OP needs to drope the hamer.
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Originally Posted by adlai
(Post 21430335)
Is it the weight or the rolling resistance?
You are slow because you chose tires that have stiff carcasses with high rolling resistance, and/or you're out of shape. Try the Continental GP5000. Unfortunately, there aren't a lot of low rolling resistance tires available in that width. https://www.slowtwitch.com/articles/..._Crr_chart.png |
I run 32 Gatorskins at around 60psi on my Cross Check. They definitely seem slower to me but I find at that width light gravel and dirt are fairly easy going even though they're slicks.
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Originally Posted by freeranger
(Post 21430688)
Are you airing them up to the max? If you are, trying running them a little lower, maybe 10-15psi lower, should be faster than running the max.
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Originally Posted by epnnf
(Post 21431355)
how does lower psi make you faster? I thought it slower
Relevant: https://blog.silca.cc/part-4b-rollin...-and-impedance |
Originally Posted by epnnf
(Post 21431355)
how does lower psi make you faster? I thought it slower
However, you need to be careful that you don't air your tires too low else you'll get snakebites where the rim and the inner tube are squished together causing a tear, thus a puncture. The poor surface can slow you down by making you less efficient riding and thus slower. It's hard to pedal efficiently when the bicycle is juddering and bouncing all over the place. However, tire width is different from how well the tire rolls. You still need to have a slick or fast rolling compound if you want your bigger tire to be anywhere near as good as a thin tire. Remember that there is also a bigger contact patch on the surface of the road which should give you a bit more grip. It's a bit like how disk brakes weigh heavier, but for the average rider they'll have more confidence to brake later in adverse conditions so will end up being faster. Disk brakes just work better in the wet - not massively better some would argue, but enough to give a rider a lot more confidence. I run my 23C tires at 80PSI. (I've had my rear go down as low as 60psi without any issue (also without noticing!) But then if I weigh up the bike a lot I might put more air in them. |
Originally Posted by Ross520
(Post 21430541)
I'm sure they're faster on bad surfaces, so maybe it cancels out the slower performance on well-paved roads if you ride a mixture of surfaces?
I, personally, don't have the opinion that 32s are "slow", just that in good surfaces a 28, or 25 would be a little quicker. I've noticed that OP has some, uh, interesting takes on various topics. |
Originally Posted by adlai
(Post 21430335)
Is it the weight or the rolling resistance?
Is this another troll fest? |
Originally Posted by ABQIan
(Post 21431345)
I run 32 Gatorskins at around 60psi on my Cross Check. They definitely seem slower to me but I find at that width light gravel and dirt are fairly easy going even though they're slicks.
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Originally Posted by adlai
(Post 21430335)
Is it the weight or the rolling resistance?
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The OP is right, wider tires are crazy slow. I have a 31 mile loop (with ~1,300ft of elevation) that I ride a couple of times a week. Takes about an hour and forty on my Cervelo (on tubeless 23s) but with wide tires? Woof, it takes forever. Could be as much as 6, even 8 minutes more. Just rode it a few days ago on 700x35s and it took 1h48m... oh, that bike also only has one gear.
...and just in case anyone missed it, this was <sarcasm> |
I noticed that the difference was much smaller when I stopped filling the bigger tires with Jello instead of air. Who knew such a small change could make such a difference?
Mind you, I was using red Jello. If it had been green or yellow, I think it would have been even slower. |
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