Hey Alpinist if you can pull it off first i promise to help you sellling them :) i am rooting for you........ please do it.
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Some reference material for anyone else who is also looking at a Nuvinci<>Gates drive on a BBSHD
Nuvinci with gates rear sprocket: "Beltline" 44.5mm
BBSHD standard chainring centerline: 50 mm
Gates inner arm dia (front sprocket): 114.5
BBSHD clutch housing (what you have to get around if moving beltline inward): 123 mm
Thus: cut gates inner bolt arms off and secure around ring area to an adapter (custom)Last edited by Alpinist; 06-18-2016, 09:17 PM.Comment
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Eric Luna - I don't think I can make a successful adapter for the Luna Eclipse. On my set up, the intermediary ring that would join the gates and the Eclipse together would need to be about 3mm. The Gates OEM sprocket has too many cut-outs (for look and weight) that there is no way to get the Eclipse bolt pattern to transfer to the gates sprocket. Which means, there would be no thru-bolt connection through all three pieces - one has to bolt the Eclipse to the custom intermediary ring that I make and then bolt the gates to the ring using a different pattern. Why this is an issue is that I feel 3mm of thread is insufficient to secure the two pieces on either side of my custom ring.
The solution is to use an adapter like the Luna 130 bcd or the California e-bike adapter and then make a beefier ring in the middle to join the gates and adapter together. This is what c-cap did on his build. This is the pathway I am going down next. I really wish I could use the eclipse, but I don't see a way to make it work.Comment
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Got the parts on my new frame. Eclipse looking awesome as ever!Comment
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New build with Eclipse Nuvinci chain drive. Gates system will be future buildComment
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Hi It appears that a 55 tooth gates cdx "beltring" has good tolerance for the eclypse. This I've yet to fully verify. It would need to be drilled out for the 7 bolts and have the 5 bolt 130mm webbing removed. 55T cdx is roughly the same diameter as 42t chain....not as big as it sounds.Comment
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I have the 60t gates ring, but have yet to find either a 55 or 60 that has a cut-out pattern that provides more area to attach the eclipse. So far, it appears to need more than the 7 bolts through the eclipse, more likely an intermediary piece with many bolt holes for the gates and 5 holes for the eclipse
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Nice,
I like the stealthiness and understatedness, maybe even moreso if those model names were peeled off the front rim. I mean, I even take a little Dremel wire wheel to get the trade names and logos off bike tires. I also like the industrial-like colors, such as black, gray, charcoal, silver, graphite, maybe a touch of white or red, possibly even a yellow accent somewhere, etc.
But that's just me...
And I look forward to seeing some customer-developed belt drive eBikes.
Originally posted by Alpinist View PostLast edited by Christian Livingstone; 07-05-2016, 02:45 PM.Comment
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hey aplinist...i have the new 130 spider i can send you complimentary....pm me your address... that is the way to go....
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What? Do you have an intermediary ring available for belt drive?Comment
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This is what I 'm talking about...it's 🔨 🕙
!! See you all in Fairfax tonight at 6 for the Marin mountain bike Hall of Fame inductee ceremony.Comment
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Shall have the bike set up next weekend. I'm for sure going to "ride it hard". I think that the 7 longer stainless m4 through bolts with nylocks and threadlocker at the outsidediameter of the Luna Eclypse will not be a fail point. I did notice that as mere screws on the chainRING that they had started to loosen up.. Threadlocker advised.Comment
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Ok,beltdrive up and running. 30 plus miles an hour(private property) until the little mini Cube ran out @ 30 amps continuous.Belt did not have issues- off road some mud and rocks at mostly full throttle .NO chain jerk/slap, dead silent. Flying on single speed 55t front 24t rear.Comment
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HI Alpinist - you've done the math - am I wrong in thinking that, given a standard, not modified (cut back) 68mm bottom bracket and a BBSHD, one could never reach a mid-forties chainline, regardless of what configuration of parts you tried.
I say this as I measure my unmodified 68mm BB with a BBSHD (no spacers), Eclipse chain ring / Nexus IGH), and currently ~45-46mm chain line. The 3/32 (2.4mm) chain barely clears the center nub on the BBSHD motor spindle axis. There's no way one could cram a 12mm wide belt in there (4x the chain width), using a sensible diameter belt pulley - based on this I estimate the very best chainline you could get with a belt is the very high forties, and at that the belt would be rubbing on the motor spindle nub.
The nub / chain clearance:
Unless you're willing to chop back the BB ...Last edited by ncmired; 11-04-2016, 06:25 AM.Comment
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Hi O.D., yes that is how I see it too and I come up with the same math. Unfortunately the only way I see a belt working is having a beltline in the 50's range. Thus a 3 speed hub or a Rohloff or... something that gives you the ability to shim the cog outboard. My nuvinci N360 hub will never get there :(. I will say that the chain drive BBSHD and Nuvinci works superbly. I have over 2k mi on it and going strong. Broke one chain, but that was my fault for standing on the pedals up a hill while at full throttle and on a worn out chain... hehe.
Saving up for a rohloff one day. until then, I will ride my 30 miles a day commute with a chain drive and enjoy the near silent fun times.
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Seems S/A has a fat 3spd that Karl reviewed. Probably nice but the SS does the job for me on a light bike.Comment
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