These are Americans!!
who's going to be first to get the bag of bricks and a tape measure out?
I was just going to ask a physics/maths student/professor next time I ran into one.
Well I am going to ignore all the physics for a moment and wonder why this chap posted the video on line. Yes, he should probably have been further away, and yes, the lady's anger is quite disturbing, but she seems like quite a litigious (is that the word) type, telling him he would pay for the damage to her bike. Makes me think it wasn't a corporate day out. She seems like the type to sue for damages due to the stress of humiliation. I watched this last night and couldn't sleep it was that upsetting!
I imagine there are a number of real variables e are missing
At a guess with small differences in weight the increase weight is balanced by increased grip - however there will be a limit to this effect I guess hecne the truck taking longer but not 40 times longer
@Also it might be easier for a lower weight rider to reach teh limits of grip.
its beyond our collective knowledge to give a definite answer it appears however. I'll try to do some experimenting and report back 🙂
Its certainly my experience that rider weight makes little if any difference to stopping distance. Certainly the tandem stops in a similar distance - I believe significantly less. Its certainly much easier to stop hard as you don't go over the bars - it will always slide the front before going OTB no matter the terrain. Progressive building up brake force yo can really feel the weight transfer onto the front tyre and feel it squidge into the ground
I watched this last night and couldn't sleep it was that upsetting!
Are you ****ing us?
I think there are certain etiquette and conventions that exist on a bike that don't in a car. I think she was almost totally in the wrong, you don't slam on and stop on a trail like that. I imagine the scenario is more akin to riding in a road group rather than driving your car and if you brake erratically or suddenly in a road group they'd certainly let you know whose the fault was! She is an idiot compounding her idiocy with aggression, possibly the worst kind of idiot.
If she's inexperienced then she'll learn from her error, if she's experienced then someone needs a quiet word in her shell-like to not be a total psychopath.
+1 for he's too nice she's a horror-bag
Haven't read the rest of the thread but my 2cents (to stay with the American theme)
- The guy was catching her up - he was obviously faster - how far back are you supposed to ride when you are going to pass someone anyway?
- She shouldn't have slammed the brakes on for a small root but I assume she is a beginner sot that's the kind of thing that happens.
- It did look a bit awkward/sore for her leg.
- Major over reaction from her anyway.
- Smooth trail - why did they need full face and all the body armour? - Does it get worse further down the trail.
- Americans. Just Americans.
screw the variables and the maths.... we've lost sight of:
TandemJeremy - MemberRealman - bullshit - you obviously cannot use the brakes properly - 20 mph on a gravel trail you can stop in a few metres - 5 or so easily.
prove it 😛
Cynical-al - er - maybe that was a slight exaggeration 😀
I have to say I'd still put the majority of the blame on the woman.
It's not the same situation as on a road (where you don't get blamed for going into the back of someone who's done an emergency stop AFAIK).
And also the women can't really say the guy was riding too close behind her, as it looked like she was riding equally close to the guy in front of her.
Phil - I will attempt to do so. - yes I am that sad - I'll measure stopping distances and post up the results.
Did this once for tamac and 30 mph and got around 7m but highly innacurate.
Problem with the whole stopping discussion, with respect to tyre grip, braking power and all that is that on a gravelly surface the limiting factor is that you will start to drag the surface over itself. Not entirely of course, but you will have some bits of gravel that just get pulled by the tyres and will cause some sliding, as you stop.
I suspect the interaction between tyre/brakes/loose surface/base surface is very complicated.
I'd be well impressed though if you can stop in 5m from 20mph on a gravelly surface. I wouldn't be able to get up to 20mph on a flat surface anyway repeatedly to make the experiment statistically meaningful!
I'm cycling back to my car now, so can investigate approximate braking distances on the way.....not sure how safe it will be though!! 😉
[i]yes I am that sad [/i]
I don't think you'll get any argument on that one 😉
20mph downhill though tj... I couldn't ride that fast on a flat so must be impossible for everyone else too.... fact 😆
Sorry, I'm not reading 4 pages of arcane stopping distance geekery... BUT:
😆 Funniest helmet cam vid ever? If someone I rode into threw their bike at me, I'd call them ****ing insane and then pedal off like a good un.
Can't be bothered reading the whole thread.
As in cycling/skiing/snowboarding the person in front has right of way - always.
The person behind is totally out of order.
I have been crashed into on a piste. The person behind said I was turning in front of him. Yes I was turning, that's what you normally do in skiing. As in biking you can't always look around and see what's coming up behind.
Girl in video was a bit over the top though.
Had to wait until I got home to view the video. It was the blokes fault but she overreacted. Yes she slammed the brakes on but they were on a blue and he should of expected beginners to be there. I don't think she wanted to be there and that was the last straw; her male friend was obviously embarrassed by her behaviour.
Puzzled by the body armour and full facers though. Does it have an uplift or something or were they progressing to a black later in the day?
I love STW - video of an idiot mashing into the back of another rider, the other rider completely overreacting and going psycho... and you're discussing physics
+1
far to many keyboard "geniuses" here 🙄
That was probably the best wheelie she's ever pulled. Helped her get over the root anyway.
Stormtrooper looky likeys on bikes?
Just been shown this video by hubby as I was out last night. Sorry if other posts have said this but there seems to be alot of discussion on the topic.
As I see it he should have realised the other riders were less confident/competant than him as he caught them so quickly. Therefore he should have considered that anything could happen and ridden accordingly, leaving space, calling a warning etc.
However....she's loon who has managed to put female mtbing back 20 years with her attitude. Blimey missus chill out, she got a tap on the bike because she slammed on the anchors a bit suddenly, fell off and ranted at the poor bloke. He said sorry, she made him feel rubbish. Not good for anyone really.
Ah well at least the body armour did it's job (let everyone know she's female cos it's pink!).
Reminds me of spooky woods on a saturday afternoon. And Halo.
I'd have probably smashed her back door in
The reaction sold it for me. She didn't even look at him before she poked him with her bike, ride on . Ride on.
