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Step 4Step Four: Underbar Steering
I wanted to figure out a way to make the bike steerable with under bar steering. Other bikes I had ridden in the past had a semi-complex mechanism which involved a second 'head tube' with a tie rod up to the fork. I didn't want to incorporate that much complexity into my design so I opted to install a handlebar stem through the bottom of the fork.
Since the fork's inner diameter at the bottom is smaller than at the top I decided to grind/sand/file down the stem itself to reduce it enough to fit. The fit was still very tight and I had to drive it in using heat and a dead blow hammer. Using a 10"x3/8" carriage bolt down though the seat post and fork was used to both marry the front triangle to the rear, but also to securely fasten the stem in place.
I settled on a set of beach cruiser bars (pictured later) which provided sufficient reach and leverage.
Since the fork's inner diameter at the bottom is smaller than at the top I decided to grind/sand/file down the stem itself to reduce it enough to fit. The fit was still very tight and I had to drive it in using heat and a dead blow hammer. Using a 10"x3/8" carriage bolt down though the seat post and fork was used to both marry the front triangle to the rear, but also to securely fasten the stem in place.
I settled on a set of beach cruiser bars (pictured later) which provided sufficient reach and leverage.
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