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The Roll Center

One of the most important characteristics of a skate truck, but almost totally ignored, is the roll center. I was one of the first people to discuss this back in 2000 (20 years ago!) and I’ve seen a few people replicate my explanation but not many. As I’m wrapping up the design of the new … Read more

The contact patch

This made my day and was very nice to see. Owen at Donard Custom Bikes in Northern Ireland posted this image to his Instagram. Three tires contact patch. Each at 70psi. The top three are with a road tire labeled 25mm (26mm actual) loaded 0kg, 35kg and 70kg. The middle three are with a road … Read more

OGLE Center Lock Rings

This was a nice gift that showed up last week. I was talking with Josh Ogle on the phone last week, I can’t remember what started this, I think that I called him about center lock threading. I was talking to him about some nerdy detail for modeling and engineering threads using equation driven formula … Read more

The problem with water bottles and hard forks

Red rubber baby buggy bumpers bounce. Red rubber baby buggy bumpers bounce. Red rubber baby buggy bumpers bounce. In the past 5 years, I’ve been doing a lot of work with rigid forks on bikes. From klunkers to hybrids, there has been so many layers of the onion that have been pulled back within the … Read more

The end of the all-road.

The last pieces to the TIE Advanced puzzle have come into place. Largely, the use of a much larger front tire. Just as moving the front tire of the klunker to 29×3.0 was completely transformative, it has been on the TIE. Of course, I knew this to be the case. This is how bikes work. … Read more

CCTC Tricep Press Down Bar LAT Pull Down Bar Handle Attachment f

It’s been 2 1/2 years since the PVD T-47 Airspeeder shifted my understanding of what a narrow gauge bike could do. That bike is still well ahead of what anyone else is doing but I’d found it’s limitations and ways to improve it. During COVID, most of my riding has been on my all-road bike … Read more

The SKYNET Master Plan

“Skynet IS the virus.” – John Connor Just over a month ago, the SKYNET chassis fixture project was announced. An open source bicycle chassis fixture that exceeds in capability over anything that can be purchased. It would be based on the PVD Cyberdyne System fixture but significantly more accessible and affordable. Since then the design … Read more

Super Ultra

Most steel tubing sold by the major brands is truly terrible for modern bicycles. The tubes were largely specified back in the 1970s for hobby builders to replicate road racing bikes. I’ve been asking tube suppliers for years for better tubes to select from. I’ve generally been ignored. Years have gone by like this. Back … Read more

The more things change, the more they’ll never be the same

I’ve been so busy over the past year and a half. I’ve done and incredible amount of work on my designs and tooling but still don’t have a finished bike to show for it. New fixtures, new designs, new everything. The new normal is ‘new’. In the background recently are projects that are large in … Read more

SKYNET

Last March, early in the COVID-19 lockdown, I set out to design and build a new frame fixture for myself. This was need-based on many levels. I wanted something amazing. Something better than anything I could buy. A fixture for a new way of doing things. The result was the PVD Cyberdyne System. I still … B.BANG Padded Bralettes for Women Seamless Strappy Sports Bra Co

Jump Ramps and Kickers

A long time ago, in a galaxy far far away…. (FS rocker shot 1/2 second late. Porter Square, Cambridge MA. 1986) A child of the 1970s, I grew up playing on cheap plastic skateboards. In the early eighties, the new boom in skateboarding and my young teenage years were a perfect storm setting me on … Read more

Engineering failures

Klunkers. Dayum. These things keep teaching me some big lessons in bike design and engineering. I have been forced to look at details in entirely new and unexpected ways to solve this riddle and that learning carries to all facets of bike design. In addition to design challenges and growth in tooling and CAD, there … Read more

MARC JOSEPH NEW YORK Men's Leather Made in Brazil Lafayette Loaf

This is an interesting bit. A week ago, PinkBike posted a video and article, Field Test: 10 Trail and Enduro Bikes Hucked To Flat at 1,000 FPS. This is cheap and easy content for them to produce and makes the little boys and girls happy. I don’t know what it really does other than that. … Read more

Back From Bali Womens Cropped Wide Leg Pants Trouser Comfort Sol

I’ve been working on my suspension bike design for about five months now. There’s no rush and I’m trying to do it right. I can prototype as much as I like in the computer and it doesn’t cost me a thing. What’s expensive is wasting money or time once I start cutting metal.  I’m nearing … Read more