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strange mine are notably stiffer than all the profiles ive tried and all the primos ive owned its the same bearings , same axle , same manufacturing process , same tollerances why pay twice as much for a few mm in the wall thickness and a different colour why do people underestimate the budget equivelent http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FC/EV-FC-M583-K-2686_v1_m56577569830625626.pdfhttp://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FC/EV-FC-MX70_SM-CR80-2661_v1_m56577569830612724.pdffatter arms , less spacers , a steel insert for the pedal thread not worth it i say but i would still rather use the middleburn rs7 , a proven crank on world cup downhill ( the suspension doesnt stop them being bashed against rocks ) and still favoured by trials riders http://images.google.co.uk/imgres?imgurl=http://mos.bikeradar.com/images/legacy/bikeradar/categories/cycling/component/transmission/chainset/images/middleburn-rs7-cranks-uno-chainring-onwhite-400-90.jpg&imgrefurl=http://www.bikeradar.com/gear/category/components/chainset/product/rs7-crankuno-chainring-9485&h=300&w=400&sz=21&hl=en&start=4&um=1&tbnid=Eag4kb6_ohc0kM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Dmiddleburn%2Brs7%26ndsp%3D18%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN