Dave's Tech Service-PA

[user58329]

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!

 

[user58329]

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.

 

[user58329]

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

 

[user58329]

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)?

 

[user58329]

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

 

[user58329]

(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

 

[user58329]

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?

 

[user58329]

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

 

[user58329]

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

 

[user58329]

Decided to changeover to the single speed coaster brake S 7 wheel.
(Opened up the 1.5-1.69)
This allows a good 6/1000th of material running 52T-415 chain sprocket
Loosely fit here, looks to be just about right!

 

[user58329]

The machining process was simple enough keeping things square & true.
(Helps having a friend with a lathe)

Additional support via a set bolt is next

The shims make the difference in getting a square three-point fit and true .6-th gap

 

[user58329]

Refurbished Chain Guard Red on Black
The frame will Remain Black and Red Fenders.

Final hub adapter with set bolt.

 

[user58329]

The “Mock-up”

Centered there’s plenty of clearance for the wide pedal crank

The front profile looks awesome!

The sprocket alignment off the “Death Row” CVT is dead on

Not liking this “bolt in” motor mount!
Going to fabricate a 1/4” steel plate and Tig

Looking down its intimidating Ducar 212cc!

 

[user58329]

Made the template 13” x 5”, 10ga.

 

[user58329]

The mark up for rear fender & fuel tank/rack

The rear view with shut-off

The fender cut away keep that pesky chain from chewing on it!

The chain route to the CVT

Top view fuel tank/rack

This is loose “adjustment phase”, may need to come forward on the rack.

 

[user58329]

Roughed in the 1/4” steel plate, fits “good & tight”

Notice the cut away for the chain

The adjustable mount makes alignment a breeze

Repurposed the old medium fenders

Then double check clearance, literally almost non-existent!