Big Bike Thread

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If you look closer, it even starts spinning up faster, the further in the elliptical arch it goes, just before the motorbike rides over it.

In addition, the wheel was forced down (just keep looking at the back wheel the whole vid), but yet these magical hubs maintained the stored kinetic energy and released it in a mysterious way. I need to get me some of those .. or maybe high tech grease?

HE EVEN UNCLIPPED while laying on the floor, and the bike kept on spinning faster.

touch said:
Haha, maybe you should take up road biking?
I think you've fallen off your MTB and hit your head too many times.
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Well, his motor would make the pushup an awful lot easier, maybe I should.
I think your leg-shaving ways are making you blind to the obvious in front of your eyes ;)

For the record, if a downhiller cheated, I'd be pointing finger just as much ;)
 
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ordered some 150mm pikes :D

might go rear shock too at some point

anyone tried a CCDB inline yet? whats all this about fattyness limits on it ?
maybe monarch debonair would be easier / cheaper / but still better than my rp23?
 
Supercow said:
For the record, if a downhiller cheated, I'd be pointing finger just as much ;)
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For the record, i'm not defending this because of any 'roadie vs mtber' argument; i'm defending this because it's a ridiculous accusation.

1- Since the last time we had this argument, the UCI have introduced tests for this. Initially x-raying the bikes, but now i believe they look inside with an endoscope. (this started in 2010 and, as far as i know, they have never found any motors in a bike.) The Vuelta is the 2nd biggest bike race in the world, after the Tour De France, there's no way they are not following UCI testing guidelines at that race.

2- Here is a random example of an electric bike linked from the ebike thread in GD:
ou8fytt.jpg

Try fitting that massive battery + large front hub motor into something the size of a rear hub on a road bike (no, you cant hide it inside the frame - the cranks are not turning in the video). Then try wiring in the controls to the rear hub and hope that the guy sitting 20-30cm behind you looking at your rear wheel doesnt notice the wires sticking out.

3- Lets assume somehow they have created this tiny hub motor + battery. The battery above has a range of 20-30 miles. That stage was over 100 miles. Ok, so maybe he isnt going to use it for the full 4-hour ride. So why did he have it turned on whilst freewheeling down a descent? This is nowhere near the end of the stage.

4- (probably irrelevant) In the circumstances of that stage, it would have been no benefit to him to have a motor. He was racing for time, the other 2 were racing for the stage win. He would have done a deal with the 2 other guys with him that he would not challenge for the stage win if the others helped him get to the end as fast as possible. He didnt care about any electrical boost to win the sprint that day.
 
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Your last assumption is exactly what I think he's done. I'm not saying it's fully motorised, but an assisted pedal in stead.

Why he would have used it there - I don't know, but there's no reason when it comes to people's stupidity. Did it malfunction and caused him to crash - we won't know.

I am ignorant when it comes to the tests, but is every single bike tested? I would imagine that for the second largest road race in the world, that not all are? Was his bike inspected post-race after this video surfaced?
 
Supercow said:
Your last assumption is exactly what I think he's done. I'm not saying it's fully motorised, but an assisted pedal in stead.
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Yes, there's no way it's fully motorised. That image of the ebike in my last post has a 250w motor, which is significantly less than the power these riders will average over a 4hour stage.

Supercow said:
I am ignorant when it comes to the tests, but is every single bike tested? I would imagine that for the second largest road race in the world, that not all are? Was his bike inspected post-race after this video surfaced?
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I dont know if every bike is tested. I would assume so because I think that the geometry of every bike is checked. The UCI technical regulations are here (2012 rules). Page 44 details the tests for hidden motors.

This is the type of hub that mavic use in that wheelset:
XPSPHKS.jpg


To me, it doesnt look like there is much room for a motor + battery in there.
 
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You make a compelling argument - though I still find it hard to swallow when I look at the video, particularly when you focus on the pressure on the rear wheel, on top of it "spinning out" of his clipped in shoe.

Is there anywhere else it could go, seat tube for example?

What speeds are they travelling at, during that stage. At the speed that wheel spins, you'd think that they were going awfully fast, much more so than it looks in the video (granted most of it's slowmo - but by the gradient and corner it doesn't look that fast). He wasn't even cranking it at the time.
 
Supercow said:
Is there anywhere else it could go, seat tube for example?
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Nope.
It's clear in the video that the crank (and therefore the chain, too) are not turning. There is no other way to transfer power from a frame mounted motor to the rear wheel.
I suppose you could have the battery in the frame connected to a motor in the hub but you'll need external wires at some point to connect them together. I'm not exaggerating when I say there will be another rider 20-30cm behind, somebody would notice wires sticking out of the hub.

Supercow said:
What speeds are they travelling at, during that stage. At the speed that wheel spins, you'd think that they were going awfully fast, much more so than it looks in the video (granted most of it's slowmo - but by the gradient and corner it doesn't look that fast)
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The stage was just over 100 miles and the winner's time was just over 4 hours, so an average of 25mph. I watched it live and they were just coming off a small descent at that point but seemed to be taking it fairly easy going round the corners (a lot of riders were saying that the roads were slippery). I would guess 27-30mph in the video.
 
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You've managed to put some doubt in my mind then, I'll concede that much.

I would like to know how on earth a wheel spins that fast, without being cranked, and after having been forced down, around a corner they were taking easy.
 
It's difficult to tell the angle of the road there, it might just be sliding downhill?

Also possible that as he hits the ground and stops sliding, the bike is still sliding and pulls against his cleat (eventually popping it out) and that gives the crank enough of a kick to spin the wheel a bit.

His bike weighs less than 15lbs, it doesnt take much to move those things around.
 
stop goin on about road bike nonsence and give me advice dammmmmit :p

ill repost it just to help you all out :cool:


might go rear shock too at some point

anyone tried a CCDB inline yet? whats all this about fattyness limits on it ?
maybe monarch debonair would be easier / cheaper / but still better than my rp23?
 
RS Will explode much earlier and easier than a DB.
I ride a DB Air CS, which is not supposed to be much different, after speaking to Keith Scott (Banshee bike designer) about the same thing.

DB takes good understanding of suspension to set up well and it's easy to screw up if you turn too many knobs at the same time. Oh, and you need a tool to do so. The CCDBair CS is the second best "Enduro" air shock I have ridden, and it's brilliant (it's marginally second to the BOS Kirk)

Now, where's my leg shaving cream and anus ointment?
 
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Supercow said:
RS Will explode much earlier and easier than a DB.
I ride a DB Air CS, which is not supposed to be much different, after speaking to Keith Scott (Banshee bike designer) about the same thing.

DB takes good understanding of suspension to set up well and it's easy to screw up if you turn too many knobs at the same time. Oh, and you need a tool to do so. The CCDBair CS is the second best "Enduro" air shock I have ridden, and it's brilliant (it's marginally second to the BOS Kirk)
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yeah the setup bit is what puts me off - maybe ill go RS when they appear
 
touch said:
You woman!


Real men shave with just water ;)
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I'll just use peanut butter and use it for both applications of lube and ointment.

gettothechopper said:
yeah the setup bit is what puts me off - maybe ill go RS when they appear
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It's not rocket science though - it's pretty damn siple, but for some reason it confuzzles a lot of people. The CCDB set up guide explains it all really well too.


Rule of thumb:
* Low Speed rebound - same as any other rebound you have ever used. Test this in car park easily enough.
* High Speed rebound - on landings off jumps and leaving the lip of a jump. Add compression to dull the bike, open it up to make her lively
* Low speed compression - refers to the movement of the shock shaft. Pedalling induced bob / deep compression corners
* High speed compression - refers to the movement of the shock shaft, particularly the hard hits once again. Stiffen to resist bottoming out.

Add compression - turn clockwise
Take compression off - turn anti clockwise
 
Had a nice ride over on the Purbecks today. Well maybe nice, definitely hard work.

Things I learned today:

1) Don't plan a ride that has 3 miles of climbing at the very start
2) I'm unfit
3) I was wrong about Reverbs when I said I didn't see the point when they first came out
4) I'm unfit
5) The Purbecks have some awesome riding, albeit you have to climb to get to it
6) There's no way I'm fit enough to ditch my granny yet :D
 
My gxp bb has given up the ghost. From some googling gxp is a crud design with bb's dying all the time. Prolly going down the hollowtech 2 route with a zee, defo the correct choice?

Also got a 2011 maybe 2012 giant glory frame in white doing nowt if anyones interested. Literally just the frame/linkage/swingarm so no shock, bb or headset. A few chips here n there and a couple tiny dents. I'll put up a pic when on pc. 200 snips collected or extra to send via courier
 
pikes and ccdb inline ordered

people on interwebs moaning about ccdb inline if your a fatty but im sure i wont care from all the awesomeness that will be going on with the new forks and shock
 
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