Recent content by qwerkus

That is quite some skill if I might say so. I've never seen someone able to weld a bike frame without jig. If you find some time during your next build, maybe make a few videos showing how yo do it ? I'm pretty sure a lot of people would find that interesting!

Congrats on your motivation to dig into framebuilding! I'm in the process of building a custom cwlb, and from my experience, welding is the least of your problems. A simple diamond shape frame should certainly be easier, yet it also comes with its own challenges. You need access to reliable...

Well my guts tell me it's too thin but I can't figure out a way to prove it theoretically. I guess my best option is to build a replica and attach weights to it until it deforms!

Tried Freecad + calculix today to simulate 3KN applied on the seat tube. Using a 45cm 36x1mm tube protruding by 250mm, I get a deflection of 3.21mm. But von Mises are super high If anyone wants to give it a try, I attached the freecad file.

Ineresting replies - thanks. Did some research, and was surprised that there is no exhaustive list of dynamic loads for something as simple as a bike frame: too many different scenarios. Nevertheless, the only relevant force in my case is the strongest one applied to my tube, which if I'm not...

No idea - the welder had it in stock. EDIT: 36x1.1mm is actually standart steering tube.

The angle of the top tube is around 6° so nearly horizontal; bike already full suspended - all I need for the seat tube is to take an adult weight without bending.

Hello, I'm working on a custom CLWB and could use some help figuring out the seat tube strength. If I bolt the seat on a 36x1mm horizontal insert tube, what's the max extension possible before it starts bending ? Thanks for your help; EDIT: Here my findings so far: Area Moment of inertia of...

Interesting reply: You went for the friction issue, while I had rather weight and overall number of components in mind. My point is: if you already have the component, you might use it for gearing as well. Keeping system complexity as low as possible seems always a smart move. BTW $30 is also...

If the mid drive is intented for the maxarya, an IGH would habe been redundant, since that bike requires a rear chain tensioner anyway. The true benefits of IGHs only makes sense if you have horizontal or sliding dropouts in my opinion, since a chain tensioner is basically a derailleur...

This one's easy. You can find them in the dealer's manuals. Here a link to a dealer that listed some of the most common hubs. Though the values are way too conservative in my opinion, so it won't help you much. I'd put my two favorite shimanos the nexus 3 and the alfine 8 at 120 n.m-2 and 80...

What data do you need ? I have plenty of shimano docs laying around...

So it's the same study. Too bad Oehler did not include the best shimano ( 3 speed and alfine 8) and older sachs/sram hubs.

Where did you get that from ? Here in Europe, there is a german study widely spread around. While it's true that under ideal conditions a new clean derailleur will beat any IGH, those conditions are very rarely met, so that in most everyday scenarios, efficiency between a good IGH and a...

Chain wear depends little on quality and a lot on maintenance/use: a long chain rolling over large sprockets will distribute forces better and hence resist to wearing/elongation longer than a short chain on small cogs. But this becomes irrelevant is the chain is constantly full of dirt, as the...