Another variation of the Grafton arms yields a Road racing arm set. Again the arm set is CNC machined from billet 7075-T6 aluminum alloy. The Speedstix 175mm left arm weighs 165 grams, while the Joystix 175mm version is 200 grams. Each of the Speedstix arms weighs less than their Joystix arm equivalent because they are a little more slender in width and thickness. At the pedal spindle they are 23.97mm wide, narrow to 18mm then gradually widen to just 32.33mm at the B/B spindle. For thickness the arms are 13.62 at the pedal spindle, thickening to 15mm. The last 100mm (4") from the B/B end have the arm gradually thickening from 15mm to a final 23.13mm at the B/B spindle. The Speedstix 175mm right arm weighs 201 grams, down from the Joystix 175mm right arm weight of 240 grams. The Speedstix right arm again has an integrated spider cut with the arm.
This Road arm uses a 130mm bolt center diameter. The swept back arms on the spider give the impression of forward motion. The spider has a nominal material thickness of 6.35mm but has most of the back of it milled away leaving a 2.45mm thickness throughout all but the edges and the support area for the B/B spindle. The pedal and crank arm cap holes are made like those on the Joystix. Speedstix will work on any bottom bracket using a two degree tapered spindle. We found Speedstix had a Bike- Pro Q measurement of 146mm. Speedstix crank arms come anodized only in very HIgh Polished, un-anodized Silver. The finish on these arms is more mirror-like than a glass mirror. They are made in 170mm, 172.5mm, 175mm, 177.5mm, or 180mm lengths. Speedstix cranks come as right arm, with integrated spider, left arm, and a set of five steel outer fixing bolts and nuts. Chainrings, crank arm bolts, and crank arm dust caps will be needed separately. The weight of the 175mm long Speedstix Road crank arms is 366 grams, the fixing bolt set weighs an added 25 grams. Made in USA. Specify length. These are not as available as they once were. There may be delays
Size-70-72-75-77-80 / S $ Price in Catalog
