DAHON SPEED D7 FOLDING BICYCLE

Riding a bike has never been this fun. The Speed combines sporty performance with unbelievable value. The frame is hand-welded from custom-drawn 4130 chromoly Sonus tubing and incorporates six different patented technologies, resulting in what is probably Dahon's stiffest frame. It features the Dahon Neos rear derailleur, a revolutionary new design that has an ultra short cage for improved ground clearance and super fast shifting. Dahon paired the Neos with an 11-30T cassette, which, when compared with the previous 14-28T freewheel, represents a 37% increase in gear range. Sleek, simple and excellent value - just what most people want in a folding bike. SuperLite 4130 Chromoly Frame is Strong, Light and Responsive Double-Butted 7005 Aluminum 7005 aluminum is an aerospace grade aluminum that is 5-10% stronger than 6061 aluminum by most measures. Double-butted tubes are specially drawn so that they are thicker at the ends of the tubes, where they are welded and stresses are highest, and thinner in the middle to minimize weight. The process of drawing and butting tubes also work hardens the aluminum. Work hardening is a restructuring of the material at the molecular level when the material is heated to a specific range, for a specific length of time, and stressed to a specific degree. Work hardening increases the strength of 7005 aluminum by roughly 20%. Double butted 7005 tubes therefore, are significantly stronger than equivalent weight plain gauge 7005 or 6061 tubes. Double butted tubing allows frame designers to build strong, but exceptionally light frames. Sonus Tubing Sonus tubing further increases strength and torsional rigidity with a custom profile. Sonus tubing is used on the main tube of all Dahon folding bikes and is massively oversized with a flat base. Sonus tubing increases strength and torsional rigidity by over 30% compared to comparably sized oval tubes. 4130 Chromoly Steel When it comes to "liveliness" and road feel, quality steel is still the material of choice for many discerning cyclists. A well-built steel frame can last a lifetime. Almost all steel framed folding bicycles are made from low-cost high-tensile (also called low-carbon) steel. Dahon only uses drawn (work hardened), 4130 chromoly steel, which is 60% stronger than high tensile steel. Because of our chromoly tubing's significantly higher strength, we can use thinner, and therefore lighter, tubing. 4130 chromoly is why our steel framed bikes feel so "right" and weigh less than many aluminum frame bikes from other manufacturers. Puro™ U6 Aluminum Alloy Puro™ U6 aluminum alloy is 25% stronger and 20% more fatigue resistant than traditional 6061-T6 aluminum alloy. We worked with the suppliers of this material to develop custom tubes for our SlipStream fork, the lightest aluminum fork on the market. 6061 Aluminum 6061-T6 aluminum is the workhorse of the bicycling world. It is used to manufacture everything from frames to stems to cranks. It is relatively light, plentiful, and easy to work with. Most aluminum frames are made from plain gauge 6061 tubing. All Dahon aluminum frames are now made using Sonus 7005 double-butted tubing. Equipped with Dahon Neos 7 Speed Derailleur Traditional rear derailleurs weren't designed for small wheels: long cages leave little ground clearance and large parallelograms protrude awkwardly from the frame, vulnerable to damage. Enter the Dahon Neos, a rear derailleur we developed with Suntour, to meet the unique requirements of small-wheeled bicycles. The ultra short cage doubles ground clearance. The ultra short cage also means that the Neos is one of the fastest and most precise shifting derailleurs on the market. Cache technology means that the derailleur body lies flush underneath the chain stays, safe from damage. The derailleur body only projects 12mm from the chain stays whereas typical derailleurs protrude by up to 40mm. Finally, we designed the Neos with ultra-light Rapid-Rise shifting action.

Specifications

COLOR Moroccan Blue SPEEDS 7 GEAR INCHES 33" - 90" DISTANCE: SEAT POST TO HANDLEBAR Min: 620mm (24.5") Max: 680mm (26.75") DISTANCE: SADDLE TO PEDAL Min: 730mm (28.75") Max: 940mm (37") FOLDED SIZE 33 x 64 x 81 cm (13" x 25" x 32") WEIGHT 12.3 kg (27.1 lbs) FOLDING TIME 15 seconds SUGGESTED RIDER HEIGHT 142 cm - 193 cm (4'8" - 6'4") MAX RIDER WEIGHT 105 kg. (230 lbs.) FRAME K Series, SuperLite 4130 chromoly, custom-drawn double-butted Sonus tubing, forged Lattice hinge, patented ViseGrip™ technology, forged drop outs FORK Integrated, patented Fusion technology HANDLEPOST Dahon Integrus, patented Fusion technology, forged clamp, stainless steel latch, 6061 aluminum handlebar HEADSET Dahon Fusion, Zero stack, cartridge bearings GRIPS SRAM SADDLE Dahon Comfort SEAT POST Micro adjust alloy BRAKES ProMax V, aluminum BRAKE LEVER ProMax V, aluminum bracket/aluminum lever CABLES AND HOUSING SIS, Pearl silver housing, slick cables FRONT HUB Dahon Special Edition by Formula, aluminum, sealed REAR HUB Formula, aluminum, sealed SPOKES 14 G, stainless steel, brass nipples RIMS Aluminum, silver anodized TIRES Dahon Roulez, 20" x 1.5", high pressure 65 psi, skinwall SHIFTERS SRAM MRX Comp, SRS technology DERAILLEUR Dahon Neos, RapidRise FREEWHEEL Suntour 11-30T cassette, 7 speed CRANKSET Cold-forged 6061 aluminum crank arms, hand-polished BOTTOM BRACKET CH, chromoly axle CHAIN KMC Z50, Narrow, Noiseless function PEDALS Folding KICKSTAND Aluminum, Dacromet bolt CLIP SYSTEM Magnetix™ system ACCESSORY Reflective pants clip RACK Arc Rack MUDGUARDS WeatherBeater Chromeplastic

Description Part No. Price Buy DAHON SPEED D7 7 SPEED 13-04094 $409.00