I like the shape of some of the rear fenders on the Martin Bros. The fender can be rough, a little rusty, whatever. Maybe someone on the forums here can help me out? The tire is an Avon AV59 130/70ZR16. Since I put this tire on, I have been searching for a fender that will fit and match up well with the tire size. The tire is just over 5" wide, which is as wide I could fit without interference from the chain. Just recently I changed the rear tire to an actual motorcycle tire, which fits nicely on the 4" wide rear rim. Added the rear disc brake and I picked up a great set of chromed wheels, which really set it off. Over the last couple of years since it was finished some minor tweaks were made. I'm just going to fast forward to how the bike looks today. Yes, the gay white seat didn't last long. The white seat will eventually be replaced by a red one, which would end up being the final color scheme. I'm planning to fabricate new rear tubes (around the rear tire) from 1" round tube to replace those stock rectangle tubes, I think the design will flow better when the entire frame is made from the round tubing. Overall length of the bike comes in right around 102" (8'6"). The handle bars shown would eventually be changed to a lower profile set. I found the billet trees on Ebay, someone had made several sets just for this application. They will end up being around 4 feet long. They will be angle-cut, horizontal with the ground. At the time these pics were taken, I still had to trim off the ends of the forks. We didn't have our laser yet so these were made the old fashioned way (with a bandsaw and belt sander). Had to fabricate custom mounts from 1/4" plate for the front wheel. (The rear section will end up being being redone later, this was the first version.) In the full side view shot, a preview of how it will look with the wheels and tires.Īnother week later and I finally got the billet triple trees and forks mounted. As you can see, about the only original parts of the frame that will be left are the crank tube, part of the seat tube, parts of the chain guard mounting brackets and the rear section. Note that I still have to cut away part of the original bottom oval tube on the frame, it's just that with the way I'm putting it together I have to leave certain parts in place until the new pieces are welded on. I built a welding fixture to hold the frame as it comes together. Here are some pictures of the frame in progress. I'm just not a motorcycle rider.Ĭontinuing. I'm a big fan of motorcycle choppers, and shows like 'Biker Build Off' and 'American Chopper' inspired me to build this bike. How about looking at it this way, maybe those Dads out there with a son that's too young right now for a big boy chopper can use this as inspiration to build a chopper bicycle for thier son. I see that this is about motorcycles here, but I thought I'd give it a shot since this forum isn't actually called club 'big boy' chopper. Well, there must be some interest in this project since there have been nearly 60 views of this thread in the first day it's been up. I will post new pictures and updates every few days. I used 1" and 1-1/2" round tube for the frame, the 1-1/2" matches the head tube and crank tube size. I work in a metal fabrication shop, so I have access to tubing, sheet metal and metal forming equipment. Fork length is about 48", stock length is 28". Head tube is stock length and tilted back at 45 degrees, this is maybe 10 degrees more than stock. From the center of the rear wheel to the center of the crank was stretched about 10". Since I am about 6'3", I had to make the bike a little larger to fit me. I started with one of those 2004 Schwinn OCC 20" Stingray chopper bicycles, like the green one shown in the second picture. This is my original, full size line drawing showing what the finished bike pretty much looks like. So for anyone interested, here goes.įirst two pictures attached. I will condense the build as much as I can, I have plenty of pictures. It has had a few more tweaks since that show. I first displayed the finished bike at the Detroit Autorama in March 2006. I just found this forum recently and thought I would post a thread documenting the build process of a chopper bicycle I designed and built during a 6 month period starting in August 2005.
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