This basic tutorial will cover cutting a simple 90 degree fishmouth into round and square tubing. A fishmouth is a semi circular cut taken at the end of a tube so that it can be joined to another round tube. In bicycle frame building, it is often necessary to cut several fishmouths into the ends of the steel tubing where the head tube or bottom bracket will be installed.
Tag Archives: cycles
Holger’s recumbent tadpole trike – Germany
Mini bike chopper from Russia
Mini bike chopper from Russia “Hello. My name is Aleksadr. I am from Moscow, Russia. I send you a photo for your gallery of builders. It’s a mini chopper I made for my son for school. I will be very glad if you put our mini chopper in your gallery. Viewing your photos has inspired me on construction of it.”
The Other Woman
“A bike I made recently for fun and to turn a few heads. I ride it around the shops with my boys and it always creates interest. Chris McPherson, Australia”
![]() |
New video series – AZTV |
The Bristol Bike Project
“We are Bristol’s most comprehensive Community Bike Project, repairing and relocating unwanted bicycles. We aim to help people from all walks of life get out on two wheels and for it to be an inclusive and empowering experience in the process.
Through our weekly workshops, we provide ‘free’ bicycles to members of underprivileged and marginalised groups that would not otherwise have the opportunity to own one. The Project combines a surplus of unwanted bikes (most of which are otherwise destined for landfill), volunteers of all abilities who are able to develop their mechanical skills within a supportive and safe environment and marginalized people within our community in need of affordable and sustainable transportation.
We are a welcoming and inclusive community-based Project, encouraging skill-sharing, promoting sustainability and helping people help themselves.”
More about this awesome group: The Bristol Bike Project
Masor’s OldSkool Rat Bobber
My name: Masor
Name of bike: Rat Bobber
Location: Santa Ynez”
bicycles, bike plans, bikes, canada, DeltaWolf, diy, homebuilt, kyoto, overkill, quadcycles, recumbents, spincycle, StreetFighter, streetfox, tadpole trike, tandem, velomobiles, warrior, welding
Mark’s Manitoba Warriors
While building these I looked around the internet for alternate ideas, but always returned to Brad’s design. I’ve seen other trikes that cost over $1,000 that don’t look as good as these. Well done, Brad & Kat.
Mark Storen aka Kindamental”
bicycles, bike plans, bikes, canada, DeltaWolf, diy, homebuilt, kyoto, overkill, quadcycles, recumbents, spincycle, StreetFighter, streetfox, tadpole trike, tandem, velomobiles, warrior, welding