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PostPosted: Sun Aug 12, 2012 10:50 am 
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Joined: Thu Apr 01, 2010 10:24 am
Posts: 599
There are plenty of 25 - 33% hills here in the UK. Here's an example I rode up recently...

http://goo.gl/maps/4ydw5

Honestly, gearing goes to pot on a hill like that. It's so steep that you pull a wheelie unless your right over the front of the bike - and then the road better not be wet or loose or the back wheel will slip. I rode 36 x 32 and it didn't seem to mean anything when on a hill like that - it's just sweat and suffering.

Edit: Also nearby is this short hill - 45 - 50% according to the locals - I rode up it and it really is the limit on what you can keep the bike upright on...

http://goo.gl/maps/JkoMd


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PostPosted: Sun Aug 12, 2012 12:11 pm 
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Joined: Tue Nov 01, 2005 9:36 am
Posts: 340
A sign along the road proofs little. Height and distance data shows the true inclination.


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PostPosted: Sun Aug 12, 2012 12:15 pm 
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Joined: Tue Sep 20, 2011 12:54 pm
Posts: 395
Location: Haines, AK - Temporarily
CarpetFibre wrote:
There are plenty of 25 - 33% hills here in the UK. Here's an example I rode up recently...
I think they're measuring it differently than many of us.

ridewithgps.com calculates Roncombe Hill at a 9% max.

http://thecycleway.com/?p=32

Quote:
At 1-2% you’ll barely notice it, like riding into a bit of a head wind
3-4 % most people will do this quite easily. It rates as hill for a non-rider but to a rider it is a mere bump
5-7% will start to bother non-riders, riders will start to find it interesting
8-9% non-riders will start to look for other ways around
10-15% is going to hurt a non-rider and they may give in, Riders will be challenged by this
15% or greater and you’re in the “praying to your deity of choice” territory. This is going to be tough. Non riders simply will not have enough strength to push themselves up this sort of a climb, Good riders will be challenged by this


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PostPosted: Sun Aug 12, 2012 1:19 pm 
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Joined: Thu Apr 01, 2010 10:24 am
Posts: 599
Most GPS methods of determining terrain height are not very accurate as their resolution is not high.

I've ridden up the 12% max gradient on Mt Ventoux (I floated up it in 39 x 28) - I'd definitely trust their measurement there and so that's what I'm comparing to. I agree the signs are usually way off the actual gradient on these roads, but seriously 1 in 3 is about right for that Roncombe hill. It is just an absolute wall in front of you. I'm a good hill climber, very light and small and I was right on my limit with 36 x 32. Looking at photos or Google Street View just doesn't give it justice. Descending it you have to lean right back and you feel like you'll go over the handlebars.


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PostPosted: Sun Aug 12, 2012 2:42 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 291
Hardknot pass & Wynrose pass in the lake district hit 25 and 33% on the hairpins. I got about 3/4s up the toughest climb on 39-25, before I hit 0 cadence and had to pull a foot out to stop falling off. 28 will be enough I think. Actually the 25%ers are doable with the 25t, but Hardknot requires just one more gear (at least for my legs!)

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