The GAUNTLET: Episode 7 of The GAUNTLET: a behind the scenes look into what goes into critiquing, analyzing and scoring the top 9 designs in the Reality Redesigned contest.
To win the
GRAND prize, each of the top 9
Reality Redesigned contestants come face to face with our 7 Judges in The GAUNTLET video series. Coming at us from the suspension category, the HAB-1 Interlocking Adjustable Suspension System qualified as one of the Top 9 designs! Kudos to Brian for his design! Let's watch as the Judges give their analysis on his suspension...
DESCRIPTION: The frame is set up for full suspension, with the rear wheel's travel radially pivoting from the crank housing (reducing weight and excess parts).
The spring and absorber are mounted to the frame and 2 flanking slides.The slides have reliefs machined into them so that mating locking pins located on the front mounting shaft can be rotated 90 degrees to either allow full suspension travel or none.
132 Comments
Where is the front wheel supposed to go on this frame without hitting the downtube? Unless the design calls for a 16" wheel mated to a 180mm fork.
No way to drop the seatpost down, unless they start making curved seatposts.
Way too much distance between seat collar and the junction to the middle tube. That means there will be twice as much leverage on this joint, then with conventional designs.
No structural rigidity on the rear end. Possible solution would be to add an asymmetrical upright bar between the left chainstay and left seatstay (ie: Santa Cruz Blur). Unless the chainstay to seatstay junctions are pivots?
Top tube is not connected to the seat tube. The heat tube to down tube junction will not only support the impact force of the fork, it will need to support the impact force of the rear suspension.
Is GT's still using its bottom bracket pivot I-Drive system any more? Seems like the pivot location would yield very pronounced pedal bob as a straight pivot (and did not use an I-Drive like system).
Massive coil-over shock with addition of side plates for lock out. Seems a bulky and heavy shock design.
It is maybe unrealistic from a legal/engineering standpoint that someone would catch his scrotum in the coil over shock, but it certainly would be a concern from a marketing standpoint. This frame would be an uphill battle to sell to male riders. That kitchenware salesperson can tell me all about how safe the new thigh-mounted cheese grater might be, but I sure won't be buying one.
And the bottom line. Modern shocks have all manner of lock out and/or pro-pedal options, so it seems pointless to introduce a wide host of new weaknesses. Take a proven suspension design and add a lock out rear shock and avoid this mess of a frame.
i would only buy a frame that looks like it will never snap!! Would any1 else???
RULE NUMBER 1 MAKE IT STRONG
Also, this completely skips over the main reason to have a pivot around the bottom bracket, which is that allows you to run a single speed setup without a chain tensioner. Commencial, Kona, and a number of others make a bikes with bottom bracket pivots for that reason: www.commencal-store.com/Files/32557/Img/14/11KCABSSX_600.jpg, www.konabikeworld.com/images/frames/2K8_COWAN_FRAME_med.jpg
That shock placement is terrible as well. Having a partial top tube like that creates a massive bending moment about the end connected to the head tube. Basically, the basic idea is alright for a 4x or slopestyle bike, but it isn't particularly innovative and this particular execution is poorly done.
or am i wrong...? seems like top notch engineers would know what they're doing.
latimesblogs.latimes.com/readers/2010/10/gloves-come-off-over-headlines-use-of-gantlet.html
Mike: "it looks like a caterpillar"
Yellow jacket girl: "smile and agree, smile and agree"
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