Aero tuck vs pedal sprint downhill - Trying to improve a Strava segment
Just for fun, I've been trying to improve my time on a short downhill Strava segment. The KOM is 55 seconds with over 14k efforts from various cyclists. My PR without really trying is 1:12 minutes and that was going aero tuck while having a few cars in my way. I tried again the other day, but this time I went with a pedal sprint, but my time was actually slower by 1 second at 1:13 minutes. There wasn't any traffic either so I was able to go all-out. I was actually surprised I was slower. My goal is to at least shave a few seconds on my time and eventually get under the 1 minute mark. My top speed was just under 40mph, with the KOM topping out at 44mph.
My question: would I be better off getting as aero as possible once I pedal to speed, but the end of the segment it flattens out so I presume I should sprint that final leg? Also my current big crank is 50t, would I need a larger big chainring to even get any faster? Would mounting a heavier wheelset help create more downhill speed? Again it's just for fun, but I like the idea of trying to improve for this particular challenge. Thanks for any suggestions! |
Get a running start and get as aero as possible which probably means slamming the stem and sitting on the top tube. Also 50x11 is too low, you would need something like 55x11 at 120 rpm to beat 44 mph
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Originally Posted by Elvo
(Post 22381028)
Get a running start and get as aero as possible which probably means slamming the stem and sitting on the top tube. Also 50x11 is too low, you would need something like 55x11 at 120 rpm to beat 44 mph
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The best thing you can do to increase your speed on a downhill is to gain a lot of weight. Start with a big breakfast with bacon, eggs, hash browns, and a stack of pancakes with butter and syrup. Drop off at the donut shop on the way to work and pick up a couple apple fritters. Find a sandwich joint that makes really big sandwiches for lunch, and remember to get some chips and a big brownie. And a 32 oz. soda. Have a couple candy bars at break time. Pizza for dinner, and a big slice of pie for dessert. More pizza as a midnight snack.
You'll have a hell of a time getting to the TOP of the descent, but you'll be unbeatable going down it. Seriously, though - if the descent is long enough, spin out your biggest gear, seated and in the drops, and then tuck for all you're worth. Flatten your back enough that you start worrying about your jersey pockets acting like tiny parachutes. I also point my knees in toward the top tube. Never done supertuck, though. Generally I keep my hands in the drops on the brakes, since 40+mph can be scary when you're only wearing a few oz of lycra. |
Originally Posted by jonathanf2
(Post 22381103)
Also you think weight cutting would help get more speed for the descent?
I'd have no problem carb cutting for a week and reduce 10 pounds off my body just for this challenge. |
Originally Posted by Elvo
(Post 22381028)
Get a running start and get as aero as possible which probably means slamming the stem and sitting on the top tube. Also 50x11 is too low, you would need something like 55x11 at 120 rpm to beat 44 mph
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Originally Posted by jonathanf2
(Post 22381103)
Darn, not really looking to buy a new crankset, though I do have a BSA compatible crank on my single speed bike. I could temporarily swap my current crank and get a cheap 56t chainring off Amazon just for this segment and run it 1x. Only problem it's a PITA to get to that segment since I need to hill climb to get there. I have a 1cm spacer between my stem and top tube, would slamming it even further make much difference? Also I'm on a slightly smaller frame and my stem runs at 130mm, so it's pretty easy for me to go super aero tuck and ride the top tube. Also you think weight cutting would help get more speed for the descent? I'd have no problem carb cutting for a week and reduce 10 pounds off my body just for this challenge. My riding buddies think I'm a bit crazy obsessing over this short road segment, but I like the idea of trying to overcome a miniature challenge that no one will even know about!
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Other serious advice - hubs. One of my bikes has 7400 series Dura Ace hubs and it is about an mph or 2 faster than any of my other bikes. Also, if you're trying to beat a record, find a day with a tailwind. That bike, on a day with a strong tailwind, I broke 45 mph on one descent that's part of my Sunday rides, where I usually max out at 42.
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Originally Posted by HTupolev
(Post 22381128)
I suspect you would have a hard time losing 10 pounds in one week through carb cutting, actually. Even a week of total starvation would be unlikely to give that result.
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Skinsuit, aero helmet. aero bike, aero wheels, Superman tuck...that should get you those precious few seconds.
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And don't forget to fill up both water bottles, and maybe tuck a third full bottle in your jersey pocket - gravity is your friend on descents.
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The first thing you should do is commission a gravity survey of the route. There may be some gravity gradients you can take advantage of.
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Originally Posted by Elvo
(Post 22381028)
you would need something like 55x11 at 120 rpm to beat 44 mph
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Originally Posted by WhyFi
(Post 22381228)
Forget cutting carbs - cut liquids! That'll get that 10 pounds off pretty quickly. :twitchy:
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Really? Downhill segments are a thing? Geesh!
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Originally Posted by genejockey
(Post 22381125)
The best thing you can do to increase your speed on a downhill is to gain a lot of weight.
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Originally Posted by mcours2006
(Post 22381241)
Skinsuit, aero helmet. aero bike, aero wheels, Superman tuck...that should get you those precious few seconds.
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Originally Posted by jonathanf2
(Post 22381314)
I have no problem with controlling my weight. I've done keto, and cut 30 lbs. in a month, plus I strength train regularly. A week is nothing for 10 lbs.!
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Originally Posted by Iride01
(Post 22381315)
Really? Downhill segments are a thing? Geesh!
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Originally Posted by jonathanf2
(Post 22381319)
Well I'm guess whomever KOM'ed the segment was in normal cycling gear, so I'm not sure it's worth going full aero!
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Originally Posted by Koyote
(Post 22381252)
And don't forget to fill up both water bottles, and maybe tuck a third full bottle in your jersey pocket - gravity is your friend on descents.
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Originally Posted by jonathanf2
(Post 22381329)
I know it's ridiculous, but it's a mini segment on the tail end of a climb and descent which I do every week. It's just for fun!
Although I'm not entirely sure that's part of your questions. I just got that idea from some of the replies I read that might have let my imagination take hold of reality. <grin> I didn't even read all of your replies, much less the entire thread. |
Originally Posted by WhyFi
(Post 22381335)
Take a look at the leaderboard and see if the KOM holder and a number of people in the top 10-20 all happened on the same day. In any area with a decent number of strong riders, groups are almost always a big factor.
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Originally Posted by jonathanf2
(Post 22381346)
That just gave me an idea, if I get my buddies to help me draft, I could potentially gain more speed. From the looks of it, the leaderboard happened during different times and years.
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Originally Posted by Elvo
(Post 22381143)
Also good to make sure you have your affairs in order like designated beneficiaries, will/trust, and advanced medical directives.
^^^This. Anyone intent on chasing Strava downhill segments should Google Kim Flint. |
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