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Added a comment about photo Mavic Crossmax XL Pro LTD Wheelset System 4/23/2015 7:53 AM
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Must be. At 23 mm they are still on the narrow side.

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Added a comment about photo Kappius Components KR-29-XCW Rim 4/23/2015 7:38 AM
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And rocks will be saying hello to the sidewalls a lot!

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Added a comment about photo 2016 Haro Shift Mountain Bikes 4/23/2015 7:27 AM
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Not a bad idea, if you make a singlepivot frame, weld up the front triangle. Just add another pivot to the seat tube and make it a 4-bar. A good idea production wise.

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Liked a comment on the item Name the Bike 4/23/2015 7:21 AM

2015 Ellsworth Truth

Added a comment about photo 2015 Polygon Collosus N9 XTR 4/23/2015 6:37 AM
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BB _RISE_?? O_O

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Added a comment about photo 2016 Trek Fuel EX Junior 4/20/2015 11:37 AM
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THe pivot might be in the way of a normal dropper post. You'd need a really short post with only about 75 mm of travel.

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Added a comment about photo Prototype Hope Cassette 4/20/2015 11:16 AM
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Make it 11spd!! 10-44 sounds ideal! And Sram's 1x11 derailleurs supposedly cover up to a 44t cog.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/14/2015 10:23 AM
C50

Ont he other hand i have also mentioned here (i think) that internal gearboxes have more drag (due to the whole cogs-bearings-shaft assembly spinning), which people tend not to like or is given as the main reason that prevents widespread use... It's a cruel world!

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/12/2015 12:18 PM
C50

True on the bump absorption part, but normal people still take it a bit more easy on a smaller bike

I had a thought to day, i wonder how a virtual pivot point would work on an Effigear. They have the freehub inside the gearbox (and sell you a fixed rear hub, with no freehub), i wonder how having a chain tensioner would work while freewheeling. I suppose chain could get thrown off, since it could just take the slack out of the tensioner and make the chain loose on the top, where it's otherwise supposedly pulled tight.

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Added a comment about photo PIT BITS - Intense M16 at Lourdes World Cup 4/12/2015 2:56 AM
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DH rims from ZTR? Is this something new?

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/12/2015 2:08 AM
C50

This thing needs more reply levels apparently.

@kc358 i was merely implying that with an AM/Enduro bike you have much lighter wheels than on a DH bike, so you will take it a bit more slow through the gnarliest of gnar, thereby not needing as high a pivot, as would be useful on a DH bike. That would then create less of a problem with Sram's 1x11 drivetrain, since there would be less chain growth and the derailleur cage geometry wouldn't be as compromised.

I totally agree on the AM bike versatility part, people were shocked when i said a DH bike would be 4th or 5th in my dream garage, behind an enduro bike, a trail bike (something along the lines of a 5010), maybe an XC hardtail and then finally a road bike (then comes the DH bike). In my view a DH bike is completely useless, unless you go to a bikepark. And if you build up your enduro bike a bit more burly, it will handle the majority of bikepark stuff.

Even more so, i'm not a fan of huge jumps or bikeparks in general, so i don't even have this problem to need a burly bike.

As for the pedalling characteristics, we have good pedalling and good bump absorbing bikes without idlers, so i don't see how varying the pivot height would cause problems in that regard. You can tune a lot and placing the pivot a bit lower in AM's case would only benefit braking performance.

But yeah, i'd really like to see a high pivot AM bike. I have started up the cogs in my head and am thinking about virtual pivot point layouts (FSR style suspensions), coupled with an Effigear gearbox, that basicly eliminates the need for an idler, etc.

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Added a comment about slideshow RIDERS ON COURSE - Lourdes World Cup DH Action 4/11/2015 2:43 PM
C138_day2a

Specialized is not a trade team at all, neither do they want to be. There's the catch. Syndicate got their application for a trade team denied because of the jerseys.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/11/2015 2:42 PM
C50

@Bikeholic that is a point, but i think it's completely safe to assume the efficiency is well over 90 %, more along 95+ %. Compared to riding 2.4 DH vs. 2.0 XC tires that is MUCH less of a difference. Maxxis High Roller II 2.4, tires which i adore, are like an anchor on asphalt.

The idler actually has a low wrap angle, it's about (or less than) 90°, where as in the front you're quite close to 180°.

@kc358 i'm aiming exclusively at Sram's 1x11 (AM) setups, that have a P shaped cage and horizontal movement. They have the P shape for the cog to follow the cassette, while the derailleur moves horizontally. Therefore it doesn't work well with a lot of chain slack, where the cage does a lot of work. With an ordinary (10-speed der.) there are no such problems.

It might not be a problem, it's a possible problem, depending on the pivot height and the stretch amount. I'd for example make an AM high pivot bike with a lower pivot point than a DH bike i suppose, there's less gnar to take care of, since the wheels can't suffer as much abuse and the trails generally aren't quite as rough as DH stuff is. So there's a bit less of a benefit with having a rearward path. IMO.

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Added a comment about slideshow RIDERS ON COURSE - Lourdes World Cup DH Action 4/11/2015 3:28 AM
C138_day2a

WTF is up with UCI? DH really needs to get away from it. The EWS guys made a right decision.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/10/2015 11:00 AM
C50

It's a prototype, it's cobbled together, it has to work, not look preety.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/10/2015 11:00 AM
C50

The Zerode has a much higher pivot point, i wouldn't be surprised if it has too much anti-squat and a too rearward axle path.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/10/2015 10:59 AM
C50

I suppose a high pivot is a bit too friendly with braking squat. Both the swingarm rotation (single pivot problem in general) AND the rearward axle path (the axle while braking is pulled backwards) compound the effect. On a normal single pivot when the axle path turns back forward, the effects cancel each other out a bit.

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Added a comment about feature FIRST LOOK: Commencal Supreme V4 4/10/2015 10:57 AM
C50

A gear pair (two cogs) has an efficiency of 0.99. A ball bearing has an efficiency of 0.99. I suspect an idler sprocket and chain are quite near to 0.99 efficiency, so the end effect is mostly negligible. The problem with gearboxes and their drag is that you always spin the WHOLE system, all the cogs and bearings. That's where drag comes from. A chain and sprocket (pyramid and der.) system don't have that problem.

The problem i see is in chain stretch on the bottom, which the derailleur would have to take up. And with Sram's P cage design (a 1-x system is IDEAL for an idler pulley design) i don't know how the drivetrain would react to all that stretching.

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Liked a comment on the item FIRST LOOK: Commencal Supreme V4 4/10/2015 10:54 AM

I hope, considering they made that prototype. That's what's always bugged me. Sweet BMWs, Zerode, Canfield Jedi, Bulls, etc. that have HPP downhill bikes that I'd love, but I don't ride downhill and none of them make a ~160mm enduro bike with the same awesome design.