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How fast have you gone on a downhill descent

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

How fast have you gone on a downhill descent

Old 08-13-14, 05:00 PM
  #51  
ph4nt0mf1ng3rs
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ive topped out at 45mph, being unable to spin at uncomfortably high speeds. As some others have said before, at around that speed personally, I start to be at the edge of my comfort zone and thoughts of skidding on conrete or running into cars that can't see me start rushing through my head. The best descent in my area imho is actually a residential road. It is made up of two pretty decent descents: one at 20% and one at 17%. Few stop signs along the way and incredibly narrow with cars in the lane AND parked cars along the curb.
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Old 08-13-14, 05:08 PM
  #52  
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53 mph on our tandem near Springerville, AZ in the White Mountains.
Have crashed, on my single, at 38 mph in Logan Canyon, UT due to harmonic vibration.
No fun and a broken humurus (shoulder bone).
Now at age 81 keep my descenst down to below the 30 mph mark.
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Old 08-13-14, 05:45 PM
  #53  
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43.2mph.
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Old 08-13-14, 06:41 PM
  #54  
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55 which was scary because the road has fairly sharp curves.
Another 50 + downhill is much straighter, so no big deal.
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Old 08-13-14, 07:13 PM
  #55  
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53.3 mph on a 2010 Fuji SST 2.0. It was so smooth I couldn't believe it. Scared me as soon as I looked at the Garmin though and applied some brake.
Here is the copy from Ridewithgps I uploaded from Garmin 500
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09_05_10 - Holladay, UT.pdf (87.6 KB, 7 views)
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Old 08-13-14, 07:14 PM
  #56  
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Originally Posted by cafzali View Post
Strava does nothing but import the data from your device. There are a variety of characteristics recorded in the file that's uploaded to Strava, depending on your device and it's capabilities. So if there are inaccuracies, it's the device that causes them not Strava.

iPhones are notoriously inaccurate at both speed and elevation because they're not using a dedicated sensor to track speed. But Garmins do --at least for those who have a cadence/speed sensor, so their speed data is very accurate. Garmins are more accurate using that sensor than satellite data.
Yeah, I should have qualified that... just the app (Strava) and a phone isn't a good recipe for accurate speed tracking, a sensor is a must IMO.
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Old 08-13-14, 07:15 PM
  #57  
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Originally Posted by GhostSS View Post
I can't vouch for it's accuracy, but straight down hill on mini aerobars. Terrible idea.


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Old 08-13-14, 07:19 PM
  #58  
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48 mph multiple times, the most recent of which was on the west side of Loveland Pass, where I was passed by a number of riders. A few of the big boys sounded like semis going by.
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Old 08-13-14, 07:52 PM
  #59  
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Originally Posted by hamster View Post
It's pretty hard to break 45. To break 50, it takes some very specific conditions (at least three of the following: triathlon bike, 6000+ ft elevation, good tailwind, long 12%+ grade, or 30+ lbs of excess fat).
Umm no. You must not be a tall clyde. I am a 6'6, 230 lbs and not 30 lbs overweight, not on a tri bike and certainly not at 6K feet, no tailwind feet and I can hit 50+ easily and need to brake to not go faster. 52 MPH is my fastest on a shortish 15% grade with braking. Anymore though I don't usually go over 45ish because I am losing my nerve in my 40s.
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Old 08-13-14, 08:02 PM
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52 mph descending Little Cottonwood Canyon in Utah. I'm 6'1 170 lbs and the summer I lived by there I routinely hit 50 mph on my road bike. It's quite easy to do on a relatively straight descent with around an 8-10% grade.
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Old 08-13-14, 08:39 PM
  #61  
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Originally Posted by hamster View Post
It's pretty hard to break 45. To break 50, it takes some very specific conditions (at least three of the following: triathlon bike, 6000+ ft elevation, good tailwind, long 12%+ grade, or 30+ lbs of excess fat).
Plenty of relatively short but steep hills here.
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Old 08-13-14, 09:55 PM
  #62  
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Originally Posted by hamster View Post
It's pretty hard to break 45. To break 50, it takes some very specific conditions (at least three of the following: triathlon bike, 6000+ ft elevation, good tailwind, long 12%+ grade, or 30+ lbs of excess fat).
??? I am a woman, so not very big, and I topped out at 48.8 mph this past weekend on a long, straight, not that steep (maybe 8%) section of road. Good pavement, no wind, probably 2000 ft elevation, just a road bike (well, it's actually a Magic Bike, but no aerobars is my point), Garmin data. I like to go downhill fast but I'm not exactly a hammer type. My HR was 155 at the time, a zone 3 or tempo effort. So if I can do it given those conditions, I'm not sure that it's too hard to do.
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Old 08-13-14, 09:56 PM
  #63  
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I have been so fast that it is literally too fast to post on this forum.
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Old 08-13-14, 10:13 PM
  #64  
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80 km/h.
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Old 08-13-14, 10:19 PM
  #65  
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Originally Posted by Machka View Post
80 km/h.
Translating that to American: 49.7 mph. See? Girls rule.
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Old 08-14-14, 12:08 AM
  #66  
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40 mph for me, at first I was nervous as well but I built up confidence gradually. Like already said I get into the drops and just relax, thats the best thing you can do. I assembled my bike from the box and made sure everything was done correctly and screwed down everything tight. It helped since I understood where everything went and how it was supposed to work. Then I doubled checked.

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Old 08-14-14, 01:26 AM
  #67  
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Originally Posted by igosolo View Post
Umm no. You must not be a tall clyde. I am a 6'6, 230 lbs and not 30 lbs overweight, not on a tri bike and certainly not at 6K feet, no tailwind feet and I can hit 50+ easily and need to brake to not go faster. 52 MPH is my fastest on a shortish 15% grade with braking. Anymore though I don't usually go over 45ish because I am losing my nerve in my 40s.
6'6 and 230 lbs is more than 30 lbs overweight (BMI 21.5 would put you at about 185 lbs). But it's possible that being that tall makes it easier for you because weight scales faster than aerodynamic drag.

Originally Posted by Heathpack
??? I am a woman, so not very big, and I topped out at 48.8 mph this past weekend on a long, straight, not that steep (maybe 8%) section of road. Good pavement, no wind, probably 2000 ft elevation, just a road bike (well, it's actually a Magic Bike, but no aerobars is my point), Garmin data. I like to go downhill fast but I'm not exactly a hammer type. My HR was 155 at the time, a zone 3 or tempo effort. So if I can do it given those conditions, I'm not sure that it's too hard to do.
This is California, and, unless you ride in the middle of the night, you can assume that there's wind. You won't feel it when you're rolling dowhill at 45-50 mph, and you may not even feel it when you're going up, but it will still be there. Checking that specific hill on that day, I see a number of people breaking 50, so it's likely that the wind was downhill. Notice that, on the following day, you had some good downhills in 7-8% range you couldn't even get to 40.

Here's a comparable local hill around here (disregard Strava elevation profile - it's actually straight downhill and somewhere around 8% for the most part): Strava Segment | TOVR Speed Trap Here's a random attempt from this week: Bike Ride Profile | This Ride sounded WAY better last night?Cooked, Toasted, Burnt and Fried (me and Coronado Hills) near Carlsbad | Times and Records | Strava This person tops out at 42 mph and it's clearly not because the hill is too short (she sits at 40-42 for 30 seconds).
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Old 08-14-14, 01:30 AM
  #68  
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49.9 mph according to the Garmin. typically.. i'm more in the 40-45mph range.

Strava top speeds are very off. My friend's has read 55mph.. when in reality, his was probably closer to 45mph.
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Old 08-14-14, 02:33 AM
  #69  
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58 mph.


not doing it again. dumb as dumb can be.
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Old 08-14-14, 02:35 AM
  #70  
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when you go super fast, you are just trusting to luck that you dont hit something innocuous that causes you to slip. a patch of loose gravel, a few wet leaves, some sand, a crack in the road.

shudder.
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Old 08-14-14, 03:00 AM
  #71  
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Originally Posted by coasting View Post
58 mph.


not doing it again. dumb as dumb can be.
+1

And they say Tri-bikes are the only ones covered in piss....
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Old 08-14-14, 03:31 AM
  #72  
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40 mph is the top end of my comfort spectrum. Even then I fear a car pulling in front of me( it's happened before), blow out, or some kind of calamity prevents me from enjoying the experience of going faster.
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Old 08-14-14, 05:07 AM
  #73  
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Originally Posted by hamster View Post
Checking that specific hill on that day, I see a number of people breaking 50, so it's likely that the wind was downhill. Notice that, on the following day, you had some good downhills in 7-8% range you couldn't even get to 40.
Lol. Are you stalking me? Pray tell, how do you know what hill I rode that day, what speed other people rode at, and what hills I rode the following day? Do I know you yet not realize I know you?
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Old 08-14-14, 05:23 AM
  #74  
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Strava/iPhone 42mph. We don't have many hills.
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Old 08-14-14, 06:53 AM
  #75  
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Just broke my record the other day. At a dead stop went down the hill with out pedaling and managed to reach 84.7km/h. I did not pedal because of it being my first time ever going down the hill but next time I will for sure and see how much of a difference it makes.
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