(ORBO) BACK40 by LTJ, design by OJ. (ROLLING! But withdrawing from the build-off.)

BOXKARS
Shop deals on ebay
Bike Wall
Advertise with us
Rat Rod Bikes Bicycle Forum

Help Support Rat Rod Bikes Bicycle Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
OddJob said:
Is that the white on your muscle bike from a MBBO build ago or two? That would be a good one. Show off those chunky black tires!
Click to expand...
That is the one! Showing off the tires was my thinking too, match the big KENDA lettering!

P3090004.JPG


DSC00343.jpg


Falstaff said:
Well I've missed a few days of this one, it's coming together nicely Luke.
I've learned in the past year on this site, white looks good on bikes. This one will be no exception.
Click to expand...
Thanks Falstaff!
blown240 said:
Wow thats a great looking bike!

That side shot is fantastic!
Click to expand...
Thank you Sir!
gigmata said:
Luke, the work is exceptional.
Click to expand...
Thanks Gig!
GuitarlCarl said:
Looks great, expectations are mounting but I doubt it will pose a problem you can't overcome. Short wheelbase and classic lines. Hmm, white paint with two tone and darts for the Klassic Klunker look?

Carl.
Click to expand...
I had not thought about darts, but I do have some decals... ;)

Just working out the sliding dropouts now, I don't have much room to play with as the rear drive is only a 14 tooth, not allowing much room either side of the chain stays, so I have to find a way to get it all perfectly lined up and still match the curve on the seat tube, I may have to move the seat tube forward slightly closer to where I originally planned it, not too hard at this point as I have not tied the twin stay/top tubes in to the seat tube yet.

Luke.
 
Yeah I think them BMX sprockets are tiny looking too, but you get clearance that way. As far as the darts go, I've been reading up on klunkers, and IMO the best looking ones have the original paint or a nice repro job.

Carl.
 
Been doing some designing on the dropouts. Looked at a few designs of sliding dropouts and then found a reference to pivoting dropouts, and down the rabbit hole I went!

Started designing, I think I am close to a finished design here, but I am contemplating lengthening the slot and putting two lock bolts in the bottom instead of just one.

Drive side:

Pivot drops drive side.jpg


Brake side:
Pivot drops brake side.jpg


I might make the pivots a bit stronger too, still a work in progress...

Luke.
 
Maybe for the ultimate strength a combination of sliding and pivot drops with full circles at the axle? It would mean removing the whole area to change a tire, but that is only three 8mm Allen heads per side, and I am more worried about extreme strength than wasting 1 or 2 extra minutes changing a tire...

PivotSlide drops drive side.jpg


Luke.
 
Luke, what would be the benefit to a pivoting hub? Seems like extra weight in bolts, more complicated welds, potential for slippage, etc. Just wondering...
 
OddJob said:
Luke, what would be the benefit to a pivoting hub? Seems like extra weight in bolts, more complicated welds, potential for slippage, etc. Just wondering...
Click to expand...
I just was not impressed by the sliding designs I have seen or the one I came up with:

Slide drops drive side.jpg


It is hard to make a sliding design work with the rear loop without looking excessively bulky.
If you imagine the frame white and the arms black on the pivot/slide design, I think that will lighten the look considerably.

Actually I just came up with an idea to make the slider look better, back in a minute or two...

Luke.
 

Latest posts

Back
Top