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62
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Forums / Question and Answer / Re: bike geometry for up and down hill---------
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on: June 23, 2014, 09:11:04 PM
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Another thing to look at now if considering 29+ is rake and trail. Nope, not talking trail building here, talking about rake (the forward offset of the axle to the centreline of the steerer tube) and trail (the measurement on the ground of the projected pivot point (caster angle) of the steerer and the centre of the tyre contact patch - lets call it caster distance) Increase the height of the tyre and the caster angle of the fork steerer moves forward, increasing the caster distance and changing the handling. More to it than just angles  Also factor in sag of a suspension fork too, this will change the caster angle significantly with 'slacker' head angles. Doesn't change so much with 'steeper' head angles. All has to work in symbiosis.
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66
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Forums / Question and Answer / Re: bike geometry for up and down hill---------
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on: June 20, 2014, 12:19:14 PM
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Frame geometry is not the only thing to consider, you have to look at it wholistically.
Take the new Fsi 29 from Cannondale. They've re-written their book on what a fast and efficient 29 should be, slacker head angle (there's that slacker word again) but have mated it with a fork rake and length that matches the frame geo to meet their handling objectives. Shorter stays and an offset rear (think pugsley/moonlander) for stiffer rear wheel build and chainline improvement. System integration is what they call it, but I look at it as 2 components that are designed together. I'm not a dyed in the wool Cannondale fan, but I respect their engineering for performance based outcomes.
Head angle geos mean nothing if the fork is not matched to create a neutral handling front with positive caster.
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73
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Forums / Bikepacking / Re: Bikepacking Paris-Roubaix
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on: June 12, 2014, 08:23:19 PM
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Cool. Your bikes look much more comfortable for the pave than a 15 pound carbon bike with 25mm tires.
True, but that's part of the attraction to cobbles on a roadie though - the suffering!  Like CX with cantis and drop bars, steeped in tradition.
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75
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Forums / Bikepacking / Re: Bikepacking Paris-Roubaix
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on: June 12, 2014, 01:30:27 AM
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Cool, so many questions on this! Roubaix is on my bucket list.
I've heard the french and gendarmes are easy going in regards to camping in the woods?
You rode the Gran Fondo?
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76
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Forums / Question and Answer / Re: Need a bike to bikepack. Paratrooper ?
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on: June 04, 2014, 08:16:56 PM
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I've serviced a few montagues, I was very impressed by the higher spec models, I'd definitely run one if I had the need for that specific type of bike for 'packing trips - MIGHT be easier to transform for carry (as in back sling carry for sensitive trails) or for packraft.
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78
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Forums / Bikepacking / Re: new fenix flash light
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on: May 20, 2014, 09:20:24 PM
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Okay, will this run on auxilliary batts - eg Power monkey cache batt. I'm planning out my ITI lighting, this might be a solution.
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