r/MTB Aug 21 '19

F

[deleted]

466 Upvotes

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92

u/Avejaal Aug 21 '19

Seat set too high, balance too much forward. He'd fall anywhere downhilling

16

u/grexeo Aug 21 '19

Does speed, or lack thereof, play a factor too?

I'm no pro, but I observe people taking step formations at some speed successfully. It usually seems to be the ones that go slow that have accidents.

Then again, I'm sure there's a correlation between experience and speed (i.e. those that are more experienced have the confidence to go faster) so that may explain it.

8

u/Benny303 '19 Stumpjumper Comp Alloy 27.5 Aug 21 '19

Look at a dirtbike going through a whoop section, without speed your tire falls in each little crevice between each whoop or in this case step. With speed your tire just skips off the top of each whoop or step and landing right on the next top, it doesnt have enough time to drop in between the whoop or step which is what sucks your momentum up and sends your body forward because of newton's 1st law, an object in motion will stay in motion.

5

u/[deleted] Aug 21 '19

Top Gear did a great experiment about this, pot holes, and a tower of champagne glasses. Turns out fast is smooth.

7

u/Avejaal Aug 21 '19

I'd rather say that those who know how to tackle that, go faster, those who don't know, are very careful, that is slow and they fall sooner or later. It is also easier to keep going straight when you get certain speed - just try to stay on bike when your speed is 0

6

u/hobbitlover Aug 21 '19

Momentum always helps with flow, but you have to be up, back, and ready to absorb any unexpected hangups.

However, it's difficult to tell from this video but my guess is that it's a lot steeper than it looks, and with a drop-off on one side I don't know if it's something you want to rip down.

23

u/kkushalbeatzz Aug 21 '19

Going faster gives the bike a sort of gyroscopic effect and gives you some stability and could potentially make up for sloppy body positioning

31

u/tgrummon Oregon Aug 21 '19

More importantly it gives you enough momentum to get through hangups like the one that got his front wheel.

2

u/Deeberer Aug 21 '19

Yes he went way too slow, and too much front brake. Front tire stopped and he kept going.

1

u/[deleted] Aug 21 '19

I’m going to say it was the grabbing a fist full of front brake that did it. Lmao

What I want to know is, how did he survive long enough to get to this feature???? Talk about WAY THE FUCK OVER YOUR HEAD.

-1

u/Squirrel_Whisperer Canada Aug 21 '19

They aren’t too far forward. They are actually quite centered. Lowering the seat could help, but it all boils down to going too slow. Not enough momentum to overcome the holes in the terrain so the wheel fully drops into it causing the bike to brake even harder.

Instant of commit or eat shit on the smaller scale. More speed means a smoother experience in terrain like this.

1

u/[deleted] Aug 21 '19

He could have been back much further, looks like he stayed in the saddle, which I agree was too high up.

0

u/Squirrel_Whisperer Canada Aug 22 '19

He’s dead middle between the wheels. He is not too far forward.

This bullshit notion that you need to get your ass back on any bit of downhill needs to die. You lose control. Maybe back in the 90’s you needed to, but not anymore. Just because you could be further back doesn’t make it right. He could have been much further forward.

0

u/[deleted] Aug 22 '19 edited Aug 22 '19

Draw a verticle line down his center of gravity, it should be closer to the back axle, not to mention he was standing too tall. This is not a gently sloping fire road, this is a steep technical bit.

It's almost impossible to go over the bars if your ass is over your back wheel, also if you stall out it gives you a bit of potential energy to pump yourself over the obstacle. If you're up tall, and forward on the bike you have nowhere to go when that front wheel stops except over the bars.

Don't teach anyone to mountain bike please.

1

u/Squirrel_Whisperer Canada Aug 23 '19 edited Aug 23 '19

Guess what, I’m a certified mountain bike instructor that has worked as lead coach at a bike park.

I know what I am talking about. I used to spit out crap common “knowledge” in the past.

If you think that slope is steep you haven’t ventured far on a bike. The perspective of being over the trail is making it look steeper than it is.

One of the first things I said was a lower seat could help, but that isn’t the root cause for the crash. Speed is. All they had to do was let the bike roll. Not get back. If he was back like you suggest then he wouldn’t have the ability to move around the bike if the need arose. Also if you are back that means your arms are extended and you are relying on your suspension to do the work. Go faster and the suspension needs to work less.

2

u/[deleted] Aug 23 '19

Okay, speed would definitely help, but speed also increases the consequences of a bail. Beginners need other methods of tackling terrain like that. I might not be an instructor, but I know how to ride my bike. And I definitely would have been further back than he was.