Dave's Tech Service-PA

[duke]

Finally stumbled onto a bracket with dimensions! 98.7 is about 3.877, the measurement for same adaptor was about 80mm is about 3.149! So, I sent text to the vendor, what size is it? I doubt they even know, just a part in a warehouse with generic diagrams.
Again, “presumed” all 3-hole adaptor are the same!
13.7mm is a huge difference!

 

[duke]

I have to say, I’m a bit disappointed that no one can chime in on vendors and product information?
Isn’t this what this forum is all about?

 

[Sidewinder Jerry]

I have to say, I’m a bit disappointed that no one can chime in on vendors and product information?
Isn’t this what this forum is all about?

From the several who've used them. They said they had to drill a hole in them so that they could be pinned. This prevents them from slipping.

 

[duke]

From the several who've used them. They said they had to drill a hole in them so that they could be pinned. This prevents them from slipping.

The 2-speed hub wouldn’t function if the adapter were pinned. Even so, can’t find an adequate adapter to fit well enough to pin! lol
Seems every turn there’s a component issue. Engineering comes into play.
I kinda hoping more parts would be readerly available
Thanks

 

[Sidewinder Jerry]

The 2-speed hub wouldn’t function if the adapter were pinned. Even so, can’t find an adequate adapter to fit well enough to pin! lol
Seems every turn there’s a component issue. Engineering comes into play.
I kinda hoping more parts would be readerly available
Thanks

I personally like using a 3 speed internal geared hub that has a disc rotor mount to mount the sprocket. Then you can use rim brakes for the rear wheel

 

[duke]

I personally like using a 3-speed internal geared hub that has a disc rotor mount to mount the sprocket. Then you can use rim brakes for the rear wheels

(Hub diameter is 40mm/1.68 so a 1.5 adapter would need machined) Or bolt the sprocket to the left flange of the hub, or even both Just get sprocket 40mm ID
The drill site for 6-bolts is .2200 diameter
The one sprocket comes 57mm ID and the 3 countersunk holes for the (adapter/adaptor)?

 

[duke]

So, somewhere past the 57mm on the sprocket and before 2.200, on the flange, place 6-bolts

 

[duke]

(I came up with 8 bolts)
77mm-diameter bolt pattern
40mm-hub id
57mm-sprocket bore
89mm-hub flange diameter

May need a slight rotation on the 3-hole positioning, or reduce bolt holes to -7

 

[duke]

Say,
If my rear hub is 40mm, slightly larger than 1.5, how much metal should I remove from the adapter ID of 1.5? .100?

 

[duke]

Finally prepared the rear brake boss for weld, measured three times with two different 26” wheels for reference

 

[duke]

Tig
Very close tolerance for cantilever, v-brakes will not fit this position at all