Dating alan frames


17-Sep-2020 08:57

Overall this is a good solid frame with the angular and square tube shapes adding lots of stiffness where it’s needed.The 27.2mm seatpost that comes with the Ultra 520 does a good job of adding comfort.Specialized says that this hasn’t detracted from its racing form, however, with the bike still able to adopt the slammed position, which can match its more aggressive partner that is the Tarmac.Buy now for £999 from Evans Cycles Read review: B’Twin Ultra AF GF Built with 6061 aluminium of “variable thickness” in Decathlon’s words (ie butted tubes) the B’Twin won’t ever worry the UCI weight limit of 6.8kg but it’s certainly no porker with our sized medium test model tipping the scales at 9kg with pedals – a respectable enough weight for an alu frame with a mid-range build.When built into a bike aluminium tubes must be larger in diameter to offset this, but the aluminium bike will still be lighter than the steel one and just as stiff.Aluminium is much more resistant to corrosion and should, if properly looked after, last a long time.Icons of Cycling: Sean Kelly’s cobble-busting Vitus 979 However, aluminium’s time as the top material for road bikes was short lived: the Tour de France was only won from 1994 to 1998 on aluminium bikes.Before then every winning bike was made from steel and since 1999 every Tour has been won on carbon.

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Aluminium is about half as strong and a third the weight of steel.But it still has its place in the market and it is well worth considering In bike years, aluminium seems like a relatively young material.For most of the bicycle’s history steel has dominated.Slender seat stays and a lack of brake arch aid compliance too and the geometry is ‘H2’, which in Trek talk means relaxed.

This build, at under £1800, comes with a Shimano 105 groupset and hydraulic brakes.Made with 6000 aluminium, the frame is light – the whole bike comes in at 8.2kg, which is actually lighter than some carbon bikes we’ve tested.



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