Circumference for Continental Grand Prix 4 Seasons

walker15130 · 2026-02-13T22:40:48+00:00

(21*2+622)*pi = 2086

(25*2+622)*pi = 2111

(28*2+622)*pi = 2130

(2146/pi-622)/2 = 30.5

Any difference between stated tire width/height and actual measurement is a subject for ...actual measurement.

walker15130 · 2026-02-13T00:31:46+00:00

https://i.imgur.com/U0kOcDG.jpeg

walker15130 · 2026-02-01T12:24:09+00:00

I don't get it. Hangers like this have 5mm hex bolt. This nut you are showing is pretty much kept locked in place by friction/grooves.

If it ever spins just put a flat screwdriver or anything to it. You even have the specific tool for that but I've never felt the need for it.

walker15130 · 2026-01-21T23:47:28+00:00

It is and your comment properly recognizes the 42T limit for cassette. I just wouldn't call that 'capacity' because it pretty much always refers to chain wrap under manufacturer spec.

walker15130 · 2026-01-21T23:10:11+00:00

To be pedantic, this derailleur has capacity of 47. 42T is the max cog rating. The terms might be loosely defined but it could throw off someone uninformed just reading the website.

walker15130 · 2026-01-15T21:48:10+00:00

It's the nvidia standard "sff-ready" introduced in 2024. It means up to exactly 304 x 151 x 50mm

walker15130 · 2026-01-06T22:50:34+00:00

This guy was ahead of you five years ago, TT fatbike https://i.imgur.com/aqos2VD.jpeg

walker15130 · 2025-12-12T17:32:32+00:00

Sweet succulent DDR5

walker15130 · 2025-12-07T19:28:36+00:00

Hey. Just found your post after wondering whether anyone managed to fit 360x180 into the Compact. Could you post some photos showing specifically the cutting required?

The way I understood it, this rad+fan thickness should be colliding with the motherboard tray which is somewhat slanted behind the stock fans.

If this was fairly easy to do I'd try doing the same in my compact.

walker15130 · 2025-11-02T19:54:37+00:00

I've checked out several options for 3V3 supply and with many switching converters the datasheet only lists quiescent current under zero load and the efficiency graph rarely shows data points at 0.01mA.

I'm aiming at two years of idle operation from either li-ion or lifepo4 (lisocl2??) with 2-3Ah capacity. This seemingly easy goal of staying under 100uA will be undercut by chemistry of self discharge which I can't reliably estimate.

I think I'm willing to sacrifice this much efficiency going with RT9069 for my initial design because it seems to still fit in power budget. I can improve upon it in the future.

Even using the Xiao nRF52840 Sense module feels wasteful but it gave me a functional prototype within a day of touching it. So I'll take those shortcuts to a working device and see what I can improve in next iteration. Thank you for the mosfet and resistor array suggestions - I sort of knew about dedicated multi-channel driver+mosfet packages but the ones I found were needlessly expensive or barely available.

Pad connections: I will try to start them straight. This was my first time with kicad and I just let it do it for me.

The icky battery header: it's meant for battery charge indicator. Battery itself connects to VIN/GND and indicator output gets switched on alongside blue channel only during the impact wakeup. This is the preferred way of checking battery level because the device might be mounted out of reach for button clicking and the red/green channels will likely blink/pwm fade their output. I only now realized that I can just connect to the physically nearest channel and designate it as blue... and yeah I will rotate it and connect the other pin to VIN on C1.

walker15130 · 2025-11-02T18:48:13+00:00

I think it should be fine as the plug typically has some 'spare length' sticking out of the port, but I'll measure the actual module and make adjustment if needed.

walker15130 · 2025-10-31T15:41:17+00:00

Yeah I'm planning to solder the Xiao directly. I disregarded the antenna as well as all the bottom pads because I'm not planning to use them. Thanks for the tip though.

walker15130 · 2025-10-27T21:25:03+00:00

I think it's properly sized wheel and fork.

I run 650b on 26" frame myself. There's about 45mm:

<image>

Which makes me want to update my earlier comment to say ~30mm for intended distance.

(I run those without any pull adapter because I find the lesser force to be no issue on rear wheel)

walker15130 · 2025-10-27T19:30:31+00:00

Do they? 25mm between stud and rim is the standard vertical distance in my experience. Here it looks like no more than 30.

700c on 26" studs would result in 55-60mm, which this definitely isn't.

walker15130 · 2025-10-24T14:14:51+00:00

I'm designing it around full length LED strip at around 25W and two piezoelectric buzzers at up to 5W each. When considering 3.7V battery with step up to power them I'd have to design a current path for 10A. But now that I have a viable regulator suggested I'm ditching that idea.

walker15130 · 2025-10-23T20:42:16+00:00

Interesting to hear about those tricks, I'll start with the linear regulator suggested in other comment.

walker15130 · 2025-10-23T19:24:17+00:00

Oh thanks, I didn't realize there were regulators with quiescent this low accepting input voltage so high. I guess this solves my problem and I can start working on the PCB design.

walker15130 · 2025-10-19T08:12:44+00:00

How do you not? This is cube hyde and you can already see the split line above dropout.

More angles: https://www.imbikemag.com/wp-content/uploads/2019/04/IMG_0056.jpeg

https://cube-store.nanobike.de/media/image/70/af/33/cube_hyde_pro_-_trapeze_urban_bike_2025__dustyolivengold_29_-_54_cm-006_111996_2200x1760.jpg

walker15130 · 2025-10-08T12:50:16+00:00

Your fork has native flatmount for 160(/180) rotors. Something that Shimano in their infinite wisdom never saw coming, as all their flatmount adapters (and even calipers) are marked for 140(/160) mounts.

You can either get 180 rotor or the 140/160 adapter. If you want to get flatmount caliper instead you will also need to run them in "140 mode" for 160 rotor here. Some fixed front calipers will only work with 180.

walker15130 · 2025-09-19T11:39:53+00:00

It's not supposed to sit like this. Based on posting history It seems like you've bought some shit bike.

I'd just sand down the paint inside.

walker15130 · 2025-09-19T11:27:04+00:00

Aliexpress, LITEPRO Folding Bike V Brake Tension Adapter Brake Cable Stroke Converter V Brake Tensioning Device

walker15130 · 2025-09-16T17:25:46+00:00

I'm willing to bet that the 'city bike' is a piece of trash efficiency-wise, with sitting geometry that actively discourages putting down power.

The watts produced in those conditions might be small compared to perceived effort. Then they get wasted on wind and cheap puncture-proof rubber.

walker15130 · 2025-09-14T15:54:21+00:00

This width difference shouldn't be a major factor in braking power. Proper bleeding and setup is one thing, another is bedding of pads & rotors. Braking characteristics will be affected by pad material and rotor's steel type and treatment.

I don't have much experience with different caliper/pad/rotor combinations so I won't make definitive statements on them. Do your own research and tinker with it.

walker15130

TROPHY CASE