OMGZ! begin rabid e-spec!
Super Clean Gearbox out of NZ
- Thread starter Pip3r
- Start date
coulda been a stick.
God you guys are dumb. Use your brains.
Hes in NZ right? The track was somewhat rough, with a 10 second sprint at the end right? KB is an elite racer, and looking at the image of the bike is clear where the mechanical came from.
He got a sheep tangled in the idler.
Hes in NZ right? The track was somewhat rough, with a 10 second sprint at the end right? KB is an elite racer, and looking at the image of the bike is clear where the mechanical came from.
He got a sheep tangled in the idler.
really the case w/ any product on rm - under the microscope, and subject to rabid ill-informed scrutiny. standard message board culture, really - a bunch of bored fanatics, what else we gonna do?
random: i for one miss the days of rampant freaky proto development. though bikes today are better than ever, the industry (apart from these guys) has been kinda boring lately...
tis true, and thank you for realizing it...that thread on "why so picky" got my goat...we're a bunch of hobbyists with nothing better to do...of course we're going to watch/criticize/get excited about new things.
bring back BCD! I loved that guy.... and it's too bad cannondale ran out of money, they were always good for crazy stuff. Oh well, I guess EVIL is still pushing the limits with their invisbl bike nyuck nyuck nyuck
we need moar shots on a iphone to get people's panties moist
Top photo, I'm kinda struggling to work out what the serrated looking bit is? Have they cut away the spoke holes on that side?
meh, needs more colorways
frame doesn't match your kits? probably be really hard to focus on your riding, eh?
As far as I know yeah.
At first I kinda thought it might be the interface for centre lock but the splines are way smaller on all the hubs I've seen.
Edit- just thought, I wonder if the spoke holes are designed to come off so you can take the hub apart for maintenance/repair??
At first I kinda thought it might be the interface for centre lock but the splines are way smaller on all the hubs I've seen.
Edit- just thought, I wonder if the spoke holes are designed to come off so you can take the hub apart for maintenance/repair??
w00dy sez the flange comes off. Not sure what the reason is, but yeah, apparently the whole spoke flange can be knocked off with a hammer.
the shell/flange spins independently of the axle/internals. sorta similar in concept to a hammerschmidt.
You mean like every other hub?
roflhauserYou mean like every other hub?
not only that, everybody knows you cant ride a white bike after labor day
no i meant its like an overdrive kind of setup. the outer shell of the hub spins more than the cog that takes the input.You mean like every other hub?
nice try tho
It's just how those hubs are made. The spoke flanges press on to a spline. It's been the case with every internally geared hub I've worked on. The hub shells are usually steel since there are multiple ratchet rings built in. So they press on stamped spoke flanges rather than hogging out a bunch of steel to make it from one piece.
Edit: It would be really cool to see them make a dedicated cog that would press on to the hub shell. That could save some grams.
assuming the cog diameter that they need to use (for optimum chain torque vector / hub positioning / compact packaging) is too small to accomplish this. if it's similar to the lahar configuration (which uses a standard granny) - the carrier is pretty light. also note the flush axle mounts - so there's no protruding nuts from the already wide frame.
would love to see the implementation of something like this - as the hub shell isn't subjected to wheel loading, you could go relatively minimalist / lightweight (carbon sram imotion 9). haven't heard much about imotion hubs. anybody have experience with them?
They can always change the diameter of another cog slightly to adjust and maintain ratios, but if a cog is large enough to bolt to the flange it is large enough to replace it.assuming the cog diameter that they need to use (for optimum chain torque vector / hub positioning / compact packaging) is too small to accomplish this. if it's similar to the lahar configuration (which uses a standard granny) - the carrier is pretty light. also note the flush axle mounts - so there's no protruding nuts from the already wide frame.
would love to see the implementation of something like this - as the hub shell isn't subjected to wheel loading, you could go relatively minimalist / lightweight (carbon sram imotion 9). haven't heard much about imotion hubs. anybody have experience with them?
I hadn't seen the iMotion with a carbon shell. Near stuff. A custom shell might be a good way to shave some weight since, as you said, there are no regular wheel forces. Even throwing it on a lathe and removing some excess material could drop significant weight.
but then you're going to have a proprietary wearing part (chainring) vs, using standard rings & a proprietary carrier that will last the lifetime of the bike. as well, bumping the hub cog size will require a larger crank chainring as well - less ground clearance, and a smidge more weight (probably dont want to downsize the rear hub cog too much for longevity concerns). makes sense to keep things as compact as possible up front for packaging reasons as well.
haha, oh how we armchair engineers ramble... does give one an appreciation for what it takes to produce a bike like this - so many variables...
eh woody ain't quite an "armchair" engineer when it comes to IG hubs.
I will concede the benefits of easily replaceable cogs. That is a big plus.
Just few days ago, friend of mine found out that Rohloff makes some OEM hub shells for some bike/trike menufacturers. And one of these custom shells is EXACTLY what Aaron Franklin and Rob with Dodzy had to gain by making a secondary sprocket carrier and attaching it via spoke flange drilled holes. The shell has no spoke flanges, and outer shape on drive side is adjusted for mounting standard 74mm BCD granny ring (the same as Lahar did). 64mm granny is impossible to put on standard Speedhub shell as primary and secondary chain will collide.
And this customized Speedhub is only 25eur more expensive!!!
If only we knew about that much sooner ...
And this customized Speedhub is only 25eur more expensive!!!
If only we knew about that much sooner ...
For the next level in DH mountain bicycle gearing I think somebody should develop geared bottom brackets!
With planetary gears similar to the Alfine and Rohloff etc. But you would have drive from the cranks going directly into the gear box in the bottom bracket. Drive could then go straight to a secondary idler gear (possibly w/ a jackshaft) mounted concentric to the (high) main pivot. Rear hub should be fixed with the free wheel also in the "BBGBox". You'd get an ideal super low COG, you could also even mount the shock low down similar to how it is at the moment on the Zerode. Ideally it would benefit from a carbon mainframe to house it all and provide the required torsional rigidity.
It would be mint!
No one is making this kind of bicycle technology yet but they should
With planetary gears similar to the Alfine and Rohloff etc. But you would have drive from the cranks going directly into the gear box in the bottom bracket. Drive could then go straight to a secondary idler gear (possibly w/ a jackshaft) mounted concentric to the (high) main pivot. Rear hub should be fixed with the free wheel also in the "BBGBox". You'd get an ideal super low COG, you could also even mount the shock low down similar to how it is at the moment on the Zerode. Ideally it would benefit from a carbon mainframe to house it all and provide the required torsional rigidity.
It would be mint!
No one is making this kind of bicycle technology yet but they should
didn't those poms do this recently (and I'm sure over history it's been done loads) - you know the crowd with the cast frame? I'm sure there was a pinion/shaft drive arrangement off the bb to rear wheel...
Fixed that for yaNo one is making this kind of bicycle technology yet but I should probably take a week or so off work and give it a wirl
Pinion gearbox and G-Box are at the BB. But both are a bit bulky. We need a narrower geared hub made by Shimano or Sram, then the guts could be put into a gearbox chassis directly driven by a BB with a cog on it. I guess sub 80mm would be ideal, rather than the 100mm width I've been banging on about it other threads.
But back to the super sick Zeroed. Any Monkeys own one yet?
But back to the super sick Zeroed. Any Monkeys own one yet?
alright time to set the record straight about the jammed chain in Napier.
We finished building the bike at about 10.45pm the night before practice and then drove to the race at 6am the next day so things were fairly hectic and we never got a chance to have a good going over the bike to make sure things were dialled. It turns out that the guide over the tensioner wheel was loose and that moved down and jammed up my chain during the race run. simple problem and a simple fix, did it up tighter and had absolutely no issues over the 25 or so runs i did last week in rotorua.
so sorry to ruin it for all of you who were speculating but there you have it straight from the horses mouth
We finished building the bike at about 10.45pm the night before practice and then drove to the race at 6am the next day so things were fairly hectic and we never got a chance to have a good going over the bike to make sure things were dialled. It turns out that the guide over the tensioner wheel was loose and that moved down and jammed up my chain during the race run. simple problem and a simple fix, did it up tighter and had absolutely no issues over the 25 or so runs i did last week in rotorua.
so sorry to ruin it for all of you who were speculating but there you have it straight from the horses mouth
Thanks.
you didn't ruin it for us... quite the contrary. How about telling us more about the bike? how it rides, how it handles various terrain and situations, etc etc etc....
you didn't ruin it for us... quite the contrary. How about telling us more about the bike? how it rides, how it handles various terrain and situations, etc etc etc....
what he said
plus:
how easy/difficult is it to do the regular maintenance on the Alfine hub?
did we get conformation as to who is building these for them? is it in fact SAPA or someone else?
so far after only a week or so on the bike im completely stoked with it, i can easily say its the best downhill bike ive ridden.
the suspension works so well through holes, roots, off cambers etc and is still fully active under braking.
as far as the maitenance on the hub im not sure yet as i havent had it long, it is really easy to adjust the shifting, the hub has a small window which all you do is adjust the barrel adjuster on the shifter untill the two yellow lines and lined up in the window and your set to go with perfect shifting.
being able to shift without pedalling is awesome, once you remember you can do it you start doing it all the time getting set up for the next sprint.
the suspension works so well through holes, roots, off cambers etc and is still fully active under braking.
as far as the maitenance on the hub im not sure yet as i havent had it long, it is really easy to adjust the shifting, the hub has a small window which all you do is adjust the barrel adjuster on the shifter untill the two yellow lines and lined up in the window and your set to go with perfect shifting.
being able to shift without pedalling is awesome, once you remember you can do it you start doing it all the time getting set up for the next sprint.
Aww KB, you're so awesome you don't even need to pedal anyways
Yep, one of the main things I missed when I sold my Lahar, you take it for granted, then get on another bike and go WTF.
Did you clip your ankles on the gearbox before you got used to it?
Thanks for the mini report. Feel free to do a bigger one
NSM, were you riding your Lahar with floating brake and/or non-floating? If the floater is parallel to swingarm, then according to theory there shall be significant difference between those two.