the gearbox thread

[xy9ine]

all gearboxes, all the time. is the derailleur doomed to extinction? planetary gears, ivt's & mystery boxes - are there designs that will eventually rise to the top & become standardized (read: affordable & commonplace), or will gearboxes always be limited to exotic applications? here's a forum for random discourse.

[xy9ine]

here's a couple random pics to start: the b1 petespeed internal deraileur:

gt's (nexus?) gearbox:

nicolai's rohloff-based g-boxx:


three interpretations. disuss.

[dw]

The 2013i, the g-boxx layout as designed by yours truly and used in the Evil 2013i and Nicolai TST.

http://www.evilbikes.com/2013i_gboxx/2013i.htm

[dw]

Not to derail your thread, but there are not too many engineers on this board, and as an aside, I dont think many of the engineers on this board have really thouroughly researched the application and its idiosyncrasies that surround each system. I think at this point, I am the only person in the world who has actually attempted to build any sort of gearbox standard and then successfully implement it on more than one bike. (The conglomeration between myself and Karl Nicolai of last year that brought forth G-Boxx)

What im saying is that you are probably not likely to come up with much more than random people saying "thats cool". Nothing wrong with that, just saying I dont think that your questions can be accurately answered on this forum.

Not to mention this has been discussed to all holy hell on this very site. Id suggest you start with the search feature.

dw

[xy9ine]

true. i think an all-encompasing forum for armchair speculation & the latest developments might be a good thing. there can never be enough redundant debate & morbid horse flogging!

[dw]

ahahah

flog on good soldiers!

[Wingnut]

I like the PeteSpeed design. Honda's is definately over-engeneered in my opinion, it's basically a four cylinder engine powered by the riders legs, but why turn perfectly good rotation into linear motion and back to rotation, is it only to acheive the near-infinate gear ratio's? Is the GT's similar to the Rohloff?

I think the derailleur will stick around for a long, long time.

[Wingnut]

Not to derail your thread, <snip>

dw

[EVRAC]

I'm a gearbox freak. I basically can't get excited about any '05 bikes, cause they all still have rear d's.

Let's start a list:

Honda
GT
Nicolai
Evil
B1
Lahar
BCD

Anyone else?
I heard rumors about a Rocky Mountain version. No pics or anything. A friend saw some drawings. Keep your fingers crossed.
The more players in this game, the better.

Steve

[xy9ine]

yay. a kindred soul. hey - you live down the street! cheers! does rm have an adequately sophisticated r&d dept. to develop something like a gearbox??

[ÆX]

I'm a gearbox freak. I basically can't get excited about any '05 bikes, cause they all still have rear d's.


BCD


Steve

[xy9ine]

damn, you build some neat machines, bcd. is that second one rohloff-based?

here's some vintage gearbox (circa 1997): paul brodie's 99'er:


i raced with a guy who had one of these back in the day. pretty nuts for the time.

[ÆX]

damn, you build some neat machines, bcd. is that second one rohloff-based?

here's some vintage gearbox (circa 1997): paul brodie's 99'er:


i raced with a guy who had one of these back in the day. pretty nuts for the time.

paul actually called me one day to " pick my brain"!

i had alway looked up to his bikes, then he called me.

it was cool.

[xy9ine]

paul is a cool guy. he's now restoring/remanufacturing vintage road race motorcycles. apparently his work is highly regarded in those circles.

[buildyourown]

bcd,
I notice your version with the der simply mounted inboard uses the same sliding sprocket that we saw in those eurobike pics. How did you accomplish this? Just wondering what you ended up using for a bearing. Considering the current offerings of hubs, I think this would be the best design. Good protection for the der but you still have parts that are easy to find should something break. Me likes!