Sunday, July 8, 2007

Temporary Roadie

So I think I classify as a roadie these last few days. I've gotten 90+ in the last few days. And those were fairly quick. I headed out again this morning for 44. I went with a guy I know from work. I did the pulling for him into the wind out to Boone. I know I've been pedaling hard lately, my chainrings are creakin just a tad. Then we jogged down to Ledges. It was his first ride >28 miles he said. Not bad for the heat this morning.

I'll try to catch the Tuesday night fixie ride. Hope to see others there.

Cool Ebay bike:






3 comments:

mr. f. g. superman said...

Nice...ideas ideas.

Forgive me, but I saw this bike the other day and it got me thinking. The suspension seemed like a good idea, though done badly. What if the same idea were placed on this one, but with a shock like that on Salsa's Dos niner? Just curious if it's one for the sketch book or if it's a bad idea.

bontrag said...
This comment has been removed by the author.
bontrag said...

Hey Cory. It sure looks cool (the Inglis that is, not the Walmart special). It seems like Inglis/Retrotec,Coconino
and Cloud Nine are the biggest purveyors of upward curving top tubes. I think with a steel curved seat stay that is the right thickness and diameter, you could get some cushion from the stay flexing. As the wheel gets forced up by a bump, the force would just slightly bend the stay. With straight stays it’d travel a bit more directly to your seat tube and then to your bum. Plus there are some things that happen to the metal depending on how those guys bend the stays.

There are a few problems with the action of the suspension though. 1) the movement of the wheel is more upward, yet the Relish would have to be mounted more horizontal if attached to a curved rear stay. That’s good for pedal efficiency I suppose, but not for bump absorption, and the shock isn’t going to be durable for a side loading like that. 2) The chain tension will slack a bit with that design. 3) You’d have to put a lot of thought into a chainstay that allows for that flex. Somehow Salsa can claim their Scandium stays do that, but I’m not sure how. Look at the Ibis SilkTi, and some Moron stays. The flat design on those is perfect. Castellano originally designed that guy, and keeps it on his new frames. But I think another solution can be found in Titus Racer X and other Trekky type frames where a pivot is near the BB. Think about how Orbea does the shock on their Oiz
, the shock is mounted almost completely vertical.

Sorry to shoot the idea down. The design would look really smooth with a seamless back bone that curves all the way to the rear hub. But I don’t think it’d end up working all that well. I started drawing up a 2D side view of this design, but at work I probably shouldn’t do that too much. If I can find some time tonight I can throw a couple CAD sketches together that’d work better.