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Post by chas on Jun 24, 2014 7:05:19 GMT
It's not to do with the length of the cage, it's when the mech was designed. 'old' road mechs (red t3) were only designed for 27 max cassettes, 'new' rear mechs (sora t5 Tiagra t7) can take a 32. A modern 'short' mech is actually quite long and can cope with a triple easily, I've used an 11/32 cassette with 30/39/50 with a short cage sora with no problems. I don't know about the microshift on white t3's.
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Post by Radchenister on Jun 24, 2014 7:40:14 GMT
Well there we go, with research you should be able to select your cassette and rear mech plus your crankset. The bit left to consider, that I think I'm on about, is the overall range. If the chain is crossed big to big or small to small, whether the tightness and looseness of the chain works. Devil's advocate - wonder if you're able to go say 53, 39, 30 up front and 11 - 32 rear? Essentially, a standard double crank plus a granny for luck and mahoosive range on the rear. Sort of gearing to climb 30% and roll out down a dual carriageway keeping up with cars plus pootle through the rolling looking at the view (i.e. all types of riding). GCN have a vid of visiting a parts store (Sky?) where they cover this a bit. TBH, I'm with ianmoss though, people can do what they like, I am simply aiming to highlight the issues and inform people sufficiently to make their own choices, based on real world experience and facts. Big ask, as we're on the internet here don't forget .
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Post by Radchenister on Jun 24, 2014 7:46:09 GMT
I better add, best not cross chain my 'extreme' triple suggestion above, if you do try it, and if it's goodbye rear mech and hanger, then don't say we didn't warn you of the risks.
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Post by Radchenister on Jun 24, 2014 7:55:08 GMT
Further thought, if I stood out the saddle on a 30/32 I reckon I'd wheel spin, similarly, I reckon leaning back would mean little wheelies - I already have to watch this on damp roads plus real steep grades on 34/30.
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Post by ianmoss on Jun 24, 2014 10:54:34 GMT
If I have to stand on the pedals (either for change of position or to get more momentum) I always change down to a harder gear to counter act the extra force applied to the pedals.
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Post by Radchenister on Jun 24, 2014 11:01:38 GMT
Not above 25% you don't .
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Post by chas on Jun 24, 2014 13:58:44 GMT
Further thought, if I stood out the saddle on a 30/32 I reckon I'd wheel spin, similarly, I reckon leaning back would mean little wheelies - I already have to watch this on damp roads plus real steep grades on 34/30. I only put that gearing on for one ride, the Bwlch-y-Groes is described in the 100 greatest climbs book 'arguably the hardest section of relentlessly steep tarmac in Britain' and I was stood up for a lot of it, though I was already knackered at the bottom trying to keep up with fitter people in the group . www.strava.com/activities/137478379/overview(several younger and fitter than me with compacts walking)
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Post by Radchenister on Jun 24, 2014 14:08:30 GMT
Just warning folks they need to watch it on smooth tarmac and damp surfaces - I'll spin the wheels if not dead smooth in delivery, I track wide around the steep switchback tight bits etc ... the problems are usually just when you're getting tired ; to be serious for a second, this sort of hill is a bit bonkers anyway and with the ride on Saturday in mind, I've only picked up to 16% gradients but there are some switchback corners with higher peaks that I'll warn people about. For safety's sake, there is no major harm in walking a short section, particularly if you're at risk of falling, clipless moments on hills are avoidable with a bit of nous - bravado might bite you if you don't use common sense, so caution is the better side of valour, I don't want to be mopping blood off people.
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Post by Deleted on Jun 25, 2014 15:27:52 GMT
I'm not an advanced rider and I don't like compact 'cose I'm dummy and the chain does atoo big jump for me and everytime I risk to break it in climbing action, so IMHO there are some good alternatives: shimano offers 12-30 cassette that even with regular 52-39 chianset, you get strongest and lightest gears similar to T3 triple: min T3 = 2,53m min shi= 2,74 (just 20cm...) max T3 = 8,79m max shi= 9,14m I've a comparison table for some shimano/campagnolo/T3 examples (2.11m wheel diameter value) maybe can be useful? comparative table.pdf
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