Wheel size

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The Rookie
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Wheel size

Postby The Rookie » Sat Nov 17, 2012 08:23 am

Great article in MBUK this month with extra info at http://magazine.bikeradar.com/2012/11/1 ... e-results/

Looks like when they picked 26 as the MTB standard it was 'just too small'.....

So which would I pick, well money no object 650B, but that is never the case, and on my budget I'll stick with 26, why? Because the above test was very much made with an effort to get all else equal, but on any sort of normal budget (so sub £4K) you'll get a lighter tighetr bike as a 26er......

Discuss!

Chunkers1980
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Re: Wheel size

Postby Chunkers1980 » Sat Nov 17, 2012 09:00 am

I say what moron created those graphs

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The Rookie
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Re: Wheel size

Postby The Rookie » Sat Nov 17, 2012 11:14 am

Graphs could have been done better, data is the important part though, not what they look like!

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supersonic
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Re: Wheel size

Postby supersonic » Sat Nov 17, 2012 11:31 am


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The Rookie
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Re: Wheel size

Postby The Rookie » Sat Nov 17, 2012 12:23 pm

Thanks SS, looked but didn't find, perhaps as the OP wasn't addressing the review!

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The Northern Monkey
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Re: Wheel size

Postby The Northern Monkey » Sat Nov 17, 2012 12:49 pm

But what tyres were used?

A high volume 26" tyre can make a wheel bigger than a 650B with a skinny XC tyre etc etc.

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The Rookie
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Re: Wheel size

Postby The Rookie » Sat Nov 17, 2012 13:50 pm

Control tyre of 2.35 Hans dampfs on all 3 wheel sizes.

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mrmonkfinger
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Re: Wheel size

Postby mrmonkfinger » Mon Nov 19, 2012 10:29 am

None of that is matched up to rider's power output.

I'm out.

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njee20
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Re: Wheel size

Postby njee20 » Mon Nov 19, 2012 10:40 am

Yes it is. Matt had PowerTaps on all bikes, and power output varied by 1-2 watts throughout the test (ie sod all).


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jimothy78
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Re: Wheel size

Postby jimothy78 » Mon Nov 19, 2012 11:37 am

The Beginner wrote:So which would I pick, well money no object 650B, but that is never the case, and on my budget I'll stick with 26, why? Because the above test was very much made with an effort to get all else equal, but on any sort of normal budget (so sub £4K) you'll get a lighter tighetr bike as a 26er......


Even more so as, if a lot of people do switch to a larger wheel size, there'll hopefully be lots of nice 26" components coming onto the secondhand market :D

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Woodmonkey
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Re: Wheel size

Postby Woodmonkey » Mon Nov 19, 2012 20:11 pm

They were all hard tails too, doesn't account for when it gets lumpy with the compromises in geometry to gain more travel.
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mrmonkfinger
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Re: Wheel size

Postby mrmonkfinger » Tue Nov 20, 2012 00:00 am

njee20 wrote:Yes it is. Matt had PowerTaps on all bikes, and power output varied by 1-2 watts throughout the test (ie sod all).


although not mentioned in the article linked to

anyway, a (human) rider + powertap with average power display, does not make for an impartial power source.

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The Rookie
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Re: Wheel size

Postby The Rookie » Tue Nov 20, 2012 06:09 am

Got a better idea, you complained it wasn't equated to power, it was, now you complain it is.......my only criticism is that the bikes shouldn't have been ballasted to the same weight but to a weight allowing for the lighter 26er wheel and fork.

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njee20
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Re: Wheel size

Postby njee20 » Tue Nov 20, 2012 09:53 am

anyway, a (human) rider + powertap with average power display, does not make for an impartial power source.


No, but it's about as accurate as you're gonna get!

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scarbs85
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Re: Wheel size

Postby scarbs85 » Tue Nov 20, 2012 10:40 am

Power variations could have assisted the 26inch bikes, meaning the margin turned out smaller than it should be. Its ppotentially a flaw, but not one to specifically aid one bike or another. Plus multiple runs will help to negate any random spikes or differences.
Would be nice to see this repeated with different riders and on different trails. The more repititions the more statistically significant the data will become.

paulneenan76
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Re: Wheel size

Postby paulneenan76 » Tue Nov 20, 2012 11:08 am

scarbs85 wrote:Power variations could have assisted the 26inch bikes, meaning the margin turned out smaller than it should be. Its ppotentially a flaw, but not one to specifically aid one bike or another. Plus multiple runs will help to negate any random spikes or differences.
Would be nice to see this repeated with different riders and on different trails. The more repititions the more statistically significant the data will become.


I agree. Whilst you don't need 100's of similar tests, you do need more than one to get a stronger indication. I'm not an expert on this but I've recently worked on something similar and you need a higher representation of the riding demographic for greater accuracy. But that's only if you want to understand the effect on the riding population and terrain/conditions the population ride.

I guess this is why demo'ing a bike to see if it suits you personally is all important.
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mrmonkfinger
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Re: Wheel size

Postby mrmonkfinger » Wed Nov 21, 2012 09:09 am

The Beginner wrote:Got a better idea, you complained it wasn't equated to power, it was, now you complain it is.......


Not particularly. I just wanted to point out there are a huge number of uncontrollable variables in this test.

However I do say full marks to BR and the rider for giving it an honest shot.


How are automotive suspension systems & wheels tested, presumably in a lab on dynos?

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The Rookie
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Re: Wheel size

Postby The Rookie » Wed Nov 21, 2012 09:55 am

Rig test or on road test, the only dyno test would be on a flat floor dyno for preliminary roling resistance and grip profile against slip angles for the tyre, but most testing is on 'road'.

The reason 29ers roll faster than a 26er is due to the lower ramp angle when hitting imperfections, so a rig test would have to involve imperfections.

JayKay3000
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Re: Wheel size

Postby JayKay3000 » Wed Nov 21, 2012 11:05 am

Although I'd say for most real world examples wheel size does not matter as most real world riders will be on a similar skill level so it ends up like apple vs microsoft vs google....


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