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radrider RichardCunningham's article
Apr 25, 2015 at 17:56
18 hours
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
there are positive aspects of urt also, but in old designs heavily outweighed by other issues. if this guy has fixed the main issue with urt maybe it is a promising design, i dont know, and we wont know until we try it or hear from some good riders to review it. I just think it wrong to pass this off as another urt design and pass it off just for that reason when the builder has said some interesting things about the functionality of his design, and the axle and bb paths show this is definitely something different. suspension geometry for bikes is mostly focused on pivot location, leverage ratios, and pedal kickback/chain stretch, and the builder seems to have addressed all of those in a really unique way, i admit i was very sceptical of this frame when i first saw the picture, but after reading about it and drawing out the frame to measure the suspension geo, i change my mind and think this is a promising design. If you disagree thats cool, but im not going to explain why i think is promising anymore then i have.
radrider RichardCunningham's article
Apr 25, 2015 at 17:42
19 hours
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
obviously your missing the point about this being a different urt design with a stationary BB...there is no reason you should expect these two very different designs to function the same way...end of story
radrider RichardCunningham's article
Apr 25, 2015 at 12:17
1 days
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
weird, it works for me. videos shows animation of the frame during travel, bb doesnt move.
radrider RichardCunningham's article
Apr 25, 2015 at 11:57
1 days
radrider RichardCunningham's article
Apr 25, 2015 at 10:53
1 days
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
think of it this way...you have seen frames with bb mounted pivot points yes??? this frame acts exactly the same way as far as physics is concerned. if the bb is not moving relative to the front triangle during travel, it is in effect the same as having the bb mounted to the front triangle. if the bb is not moving, or is moving in a horizontal direction relative to the front triangle during travel, suspension characteristics are not going to be effected by the weight changing from seated to standing any more then a virtual pivot design with the front triangle mated to the bb. You need to replay the video or pause it and slowly click through frames, but this shows how the bb and rear axle move. www.youtube.com/watch?v=DLLzyInE3oY
radrider RichardCunningham's article
Apr 25, 2015 at 10:33
1 days
radrider RichardCunningham's article
Apr 25, 2015 at 6:23
1 days
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
you are saying it only works when the rider is seated, which is true with other urt designs, but this is different. those other urt designs don't have an axle path and bb path like this frame...if the bb is not moving during travel how is this only effective when seated?
Added 1 photo to Art-and-Bike-Painting
Apr 24, 2015 at 16:08
2 days
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radrider RichardCunningham's article
Apr 24, 2015 at 13:57
2 days
Did You See That? RAM Bikes URT Chassis and Quadrilateral Fork - Sea Otter 2015
I dont think you guys know what your talking about, sorry.
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