Ratty Patty

Jan 21, 2009
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Zambales, Philippines
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I'm in! This just what I was looking for to use my 26 x 3 inch tires. I laid some stuff out a week or two ago to see if it looked feasible. With big whitewalls and a bare metal patina frame (at least the front part) I think this will make a great stretch ratty fat bike.
Ratty Patty.
My pile of frames and tires:
DSCI0002.JPG



Layed out on the floor is the plan. These two frames are old but have never been used. They are a couple from the dump where a shop threw out all the unsold frames when they folded. The main frame is an unpainted cantilever frame with lugs. It measures 20" at the seat tube, it's a good size. The red frame is a 24" cruiser frame from back in the 80's also. It will be cut up to provide the rear portion of the frame. As it is laid out, the rear tire will have clearance and I may be able to keep the cantilevers from the donor frame intact. Like a double cantilver frame.

stretch1.JPG

I'll see when I lay out the parts if the 2 bars reach to the seat tube or maybe even the down tube of the main frame. The seat may wind up right on top of the rear wheel. I want the rear just low enough so the pedals don't scrape. I'll sand the red paint off and try to match the natural patina of the main frame.
stretch3.JPG


With the whitewalls it'll have the rat look I'm after.

I need handlebars of some custom kind and wheels. I've got some stuff ordered through the local bike shop but they can't guarantee if anything will ever show up. But this build off is going until April, I'll just buy some old stuff as it comes along if I have to. There's a shop I've heard of that will custom make some bars.
The springer is all set to go. I made it wider and longer for the annual build off but parts never came to be, so it'll get used here. It's the common chinese springer with a couple plates added to make it longer and spacers added for more width. This is it on my other bike, Chrome Molly. That's also the seat I plan to use on this bike. The weight was too much for my daily rider so it's going on this big rat.
ww1.JPG

I've got an old cottered crankset to go on that looks just right for this build. Ratty.
My first step is cutting up the red frame. I'll use a hacksaw and see if I can separate the cantilevers without harming the tubing.
 
Jan 21, 2009
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My new custom workbench showed up today and it occupies one end of our dirty kitchen. I have more to add, like a pegboard and shelf above, but this is what I've been waiting for. Seven frames, wheels and tires fit under there fairly easily. Now I can start cutting up the red frame that will be the back half of Ratty Patty.

new bench.JPG
 
Jan 21, 2009
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Zambales, Philippines
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While I'm waiting and hunting for wide rims, I'm going to try an idea I had awhile back. Use 2 rims together to get more width. I have 2 rims from a crappy new mtn bike.

DSCI0032.JPG

The rims are rigid and are true. Together they are 44mm wide. The spoke holes aren't offset so I just will line them up with the valve holes opposite each other and lace it back up. One rim will get all the right spokes and the other all the left. This is where the idea might fail. The rims will want to separate from each other. The spokes won't hold both at the same time like a solid rim, and the inflated tire will want to pull them apart also. I plan on using two 26 x 1.75 inner tubes with the 26 x 3" tire.
DSCI0035.JPG

Two valve stems opposite each other. I think if one goes flat the other will have enough air to ride on.
So, how to affix the rims together? I may use epoxy if I can find some that I can be sure is strong enough to hold them together. I'm open to suggestions. Maybe rivet the inner rim edges together?
If it doesn't work, no harm done. I'm still on the hunt for 50-80mm rims.
 
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Jan 21, 2009
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I used my new bench today and got some work done.
The red frame easily came apart with a hacksaw.
patty frame.JPG


Some spots were hard to get to, but the welds were minimal. It looks like thay tacked it and forgot to finish it up. This is where the cantilevers attached to the seatpost.

welds.JPG



So I laid out the frame again to get an idea of the layout. It's seven feet long. I'm hoping to have the rear part just bolt up and not have to have anything welded or wreck the main frame.

11 oct patty lo.JPG



After I finished, my shop reverted back to a dirty kitchen after a quick cleanup.

11 oct patty cu.JPG
 
Jan 21, 2009
8,051
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Zambales, Philippines
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I managed to epoxy the rims and mounted the 2 tubes and tire. These wouldn't need truing if they worked out, theyve got no flex.
Then I noticed the rimstrips laying there! So after redoing it, I started to air up the tubes 10 psi at a time. It was looking promising.
dual wheel1.JPG


I had just gotten the second tube up to 15psi when the rims separated. "Boom!"
boom.JPG

Back to the drawing board. I'm going to continue to look for rims, but if all else fails, I have another plan to use multiple rims on one wheel. These 2 gave me 44 mm of width; if I added one more, that's 66mm, pretty close to three inches. Just one inner tube down the middle and drilling holes to attach the rims together. They will be attached with brackets, nuts and bolts. Ratty looking if I do that but it will fit right in.
 
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Jan 21, 2009
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I laced my new 2 speed hub to a rim. It's a 32 hole hub and a 36 hole rim. I taped off 4 holes at equal distances and laced it up as usual, 3 cross. I'll have the bike shop true it up and tighten it up at the bike shop. It looks good and is straight as it is but I'll have it trued just for good measure.
DSCI0001.JPG

Then it will get 2 rims attached. What is lacking from 4 spokes should be made up by how strong 3 rims bolted together will be. With the tire on will probably weigh 10 lbs or more but that's ok, the rim will be 3 inches wide.
If that works out, I'll do a front wheel the same way, only hub and rim will both be 36 hole. I'm hoping to find a coaster hub to use for front brakes.
 
Jan 21, 2009
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Zambales, Philippines
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If that wheel configuration works, I'll be able to fit two 26 x 2.0 tires instead of one 3" tire. The middle rim will provide 1" of space between the tire beads. But for this build, it'll be the big whitewalls.
 
Jan 21, 2009
8,051
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Zambales, Philippines
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I decided against the 32 hub on the 36 hole rim. it looks strong enough, but everything I've read says "Don't do it!". So, I have my SRAM Automatix 2 speed freewheel hub. I'll have to rig up handbrakes to the rear but that's ok. I'll make a mount for the rear frame for a hand brake. I'd like to find bolt on bosses for v brakes, I need the extra stopping power.
I tried to lace it up on 2 rims together. I taped off alternate holes and laced it 3 cross with spokes side by side. The spoke wrench wouldn't fit because the spokes were side by side and another downside was that I would have to do a lot of drilling to attach the rims.
rattypatty 25.JPG


My other idea uses 3 rims and uses the existing spoke holes to bolt them together with a lot of brackets. This wheel looked cool with the star pattern to the spokes, but I'm going with what I feel will be more reliable, lacing the hub to one rim 3 cross and attach two outer rims together to make a wheel almost 3 inches wide. I laced it up today. These spokes came from a 24" wheel that had the same ERD, the spot where the spokes sit. This is a recessed 26" rim. I used a website that has a spoke size calculator that has a list of hubs and rims to plug in:
Rattrypatty 27.JPG


The covid travel restrictions have eased up, so I don't need to wait in line all day to get a pass to go to the city. I'm going to the bike shop for the other rims, truing and a crankset. I'll take the rear frame sections to the welding fabrication shop to have them cleaned up and 3/8ths holes drilled for the extensions.
Then I'll make the brackets, 18 of them, for the wheel and see how it turns out before doing a front wheel. Aluminum bar 1/8th inch thick cut into 2 1/2 inch sections will be used to hold the rims together. I'll need 4 feet of bar. I plan to use 1/4 inch bolts with locknuts. The outer rims spoke holes will be centered between the spokes of the center rim. will Every other set of spoke holes will get a bracket. What could go wrong? LOL!
 

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