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Old 09-27-17, 03:39 PM   #1
NYCDahon
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What is the bottom bracket size for a Dahon Vitesse D7 Nexus internal rear hub

What is the bottom bracket size for a Dahon Vitesse D7 Nexus internal rear hub. My OEM sounds bad. What would you put in there? Shimano un55? or I can get UN26 half price... but has plastic.

Is this the length marked on the crank bolt? 10.9


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Old 09-28-17, 08:45 AM   #2
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Originally Posted by NYCDahon View Post
What is the bottom bracket size for a Dahon Vitesse D7 Nexus internal rear hub. My OEM sounds bad. What would you put in there? Shimano un55? or I can get UN26 half price... but has plastic.

Is this the length marked on the crank bolt? 10.9

I'd just take it out and measure it.

At this price point, I'd stick with the UN55. Although both spindles are hollow now ... I think. So you're literally paying for the metal cup.
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Old 09-28-17, 09:26 AM   #3
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Originally Posted by NYCDahon View Post
Is this the length marked on the crank bolt? 10.9
10.9 is the number of a bolt class (referring to the bolts strength).
Check here:
https://www.boltdepot.com/fastener-i...ade-chart.aspx
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Old 10-05-17, 12:27 PM   #4
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I pulled one from a Vitesse I7 last week. The Axle measures 122. BB shell is 68.

On a Dahon "D7" such as a Mariner D7 is generally about 116mm.
On a Dahon Vitesse "I7" for the Nexus is aiming wider at the Nexus cog, where a D7 would be aiming more toward the middle of the cassette/cog set.

Best to pull your axle/bb just to check.

I will put a 68 x 122 Sealed BB in a Vitesse next week as a small upgrade to the loose ball build.

More exciting, last week I put this Patterson 2 Speed BB/Transmission in one (the reason I pulled the axle). The Patterson transmission is really nice. Super quick shifting. No derailleur. Looks cool too.

The Vitesse is technically an i-14 now. The effective gear range goes from about 245% to 392% which is more than a NuVinci. Nicely, it widens the Vitesse range both high and low, moving the Chainwheel from 1 x 38 T, to an effective 28t and 46t.

Available now if anyone wants a really cool ride.
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Old 10-06-17, 05:05 AM   #5
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https://endless-sphere.com/forums/vi...p?f=28&t=55334
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Old 10-06-17, 08:09 AM   #6
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Finished the build yesterday (cables and pedals). It rides really nicely. The shift is about One click on a friction shfiter that has 10 clicks. Both ranges are very nice. Climb and Cruise. The original chaincover needs some modification to work and I should have installed the brackets for it when I was putting the "drive" in (transmission). I hate grease on my pants.

A few tricks on the install to the Vitesse. I will likely start a thread on the Vitesse re some upgrades and side grades.
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Old 10-06-17, 10:52 AM   #7
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Looking forward to that! OP, I can highly recommend the Sram i-motion 3, if you like it simple and light. Some of the Vitesse models came with it.
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Old 10-06-17, 11:06 AM   #8
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10.9 may be the steel , & heat treatment class, indicating it's a higher grade 8.8 is another marking signifying similar..




1.370" by 24 tpi, 68mm wide BB shell?


NB: the plastic sleeve, on the left end, will not Corrode in place, the Aluminum one can.. greased highly recommended..




....

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Old 10-06-17, 12:18 PM   #9
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Looking forward to that! OP, I can highly recommend the Sram i-motion 3, if you like it simple and light. Some of the Vitesse models came with it.
Yes, Vitesse D3 is a nice bike with the Sram. Very clean shifting. Reasonable gear range for 3 spds. Light.

I am prob going to get a few hubs to upgrade Uno type bikes. BTW the Vitesse D3 is a great deal next to a Speed Uno. For $100 extra you get the Sram I3, A Post Pump and Fenders. Actually its just a great deal.
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Old 10-06-17, 12:49 PM   #10
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Buy the UN 26, and save the aluminum sleeve from the existing UN 55, then re use it, if that will please your aesthetics, more.
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