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mack_turtle

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Everything posted by mack_turtle

  1. Singlespeed would not make a difference. One could predict a good crank length based on some static measurements and a database of thousands of bike fits (I have a book with this kind of data), but a careful analysis of spinning legs would be more useful. Inseam is only part of the story because there is no predictable geometric relationship between where the bottom of your pelvis is and where your hips joint (greater trochanter) are. That's why I resorted to slowmo video and a borrowed carpentry laser. Imagine putting 250mm cranks on your bike (and ignoring obvious pedal strike and toe overlap problems). You'd probably still set the saddle hieght the same height from the bottom of the pedal stroke, but think of the knee hinge required to turn it over at the top. Your knee will start to flare out and you'll feel that after some miles. If the ideal crank length for a rider's leg proportions is closer to 170 and they have 175s, it will be subtle and take a long time, but it might really start to bother the rider. Personal experience tells me it can make your riding miserable. Whatever crank length you're using, if your knees and hips don't hurt, don't over-think it.
  2. I though an 8-speed chain should NOT work very well on a 9-speed cassette. I think you can move "down" (10s chain on a 9s cassette) but you might run into problems going the other way. Unless the chain is really mangled in a few places, you should be able to use it for a while by replacing broken links with quick links if you break a link. A basic chain "breaker" tool, chain wear gauge, and a quick link plier are good to have around. Replace the chain when you can confirm it's worn by measuring.
  3. personal experience: crank length is mostly optimized for your body proportions. too long, and the angle that your knee has to flex at the top of your pedal stroke is too acute. your knee will start to flare out at the top of your pedal stroke. run your cranks as long as your knees can stand if you want them longer, or as short as you want, within reason. (I confirmed with slow motion video and a digital goniometer that 170s work well for me and if I go longer, my knees flare out all over the place.)
  4. what are you talking about? Haibike will be laughing all the way to the bank with all they gain.
  5. what they said: "these are bikes for getting up mountains and to help people with physical limitations ride places they could never ride before." what they meant: "these bikes are for brap bros who don't give a shit about trail etiquette, but we'll gladly take their money." I'm OK with being a crotchety retrogrouch about this. I can't do anything to stop it, but I can point out that it's absurd.
  6. no doubt, if self-riding bikes that never fall over and clear everything were available, a few people, including able-bodied young people, would buy them. this generation of people who have everything handed to them without even getting a college degree—you know, the boomers—don't believe in hard work and sacrifice toward goals. they want bikes that ride for them! who are accusing of using gears? JK
  7. mack_turtle

    20211018_112239.jpg

    not sure what happened to this photo but I can't delete it now.
  8. October 2021 ride on a warm, sunny day.
  9. *mojo mode* still, I would want to ask such a young man, "why are you such a wussy? ride a real bike, you entitled, participation trophy-expecting little bitch."
  10. I have Velocity Aileron 650B wheels with convertible hubs. the hubs are set up for 142x12 rear and 100x12 front, but I believe youcan make the front 15x100 by just removing the adapters. the rim is 20mm wide inside and sets up tubeless with ease. HG freehub has only been used with single cogs and spacers. tanwall WTB Venture tires in 47mm and a pair of Panaracer 650x50 Gravelking SKs. The WTB tires were just replaced by WTB (something wrong with the construction of the original tire) and the Gravelkings were used for one ride before I realized my frame does not hav a comfortable amount of clearance. I'm interested in moving to a 700C wheelset with 40-43mm tubeless tires. must work with 12mm axles for 142 and 100 spacing.
  11. "Mike! Miiiiiiike! He's riding an e-bike! call the police!"
  12. prohibiting e-mtbs on trails? who do we think is going to enforce that? 😂
  13. most likely, you can move your shifter around to accommodate this. depends on the shifter though. you might be able to relocate the shifter clamp outboard from the brake lever clamp, or attach the shifter directly to the brake lever. sounds like a bit of hassle, but 100% worth the effort if it means more confident control over the bike.
  14. One episode left. it's pretty dark. I feel like I'm missing a lot by being illiterate when it come to Korean culture, but it's darn well done.
  15. if you've ever worked in a bike shop and hear how many people walk in for the first time, look at one bike and say loud enough for everyone to hear "one thousand dollars for a bicycle! I'm not rich!" you'd understand how few people most likely won't buy an e-mtb. they might be convinced to buy a e-bike for utilitarian purposes (it's way cheaper than a car and does most of the things that most people do with a car every week.) here in Austin, we have a bit of a skewed sense of what the country looks like. there are a ton of people willing to pay a relatively large sum of money for a hobby, a gizmo, a novelty car, or a mountain bike with a motor on it. in other words: toys. but that's Austin with it's free-wheelin tech bros. it's an anomaly. no one is saying that an e-mtb is not fun or that it costs more than it should. it will just take a long time, or never happen, to get enough people to jump onboard for manufacturers to get their R&D costs back. to me, it sounds like they're trying to get everyone on board with helicopter-assisted snowboarding or African big game hunting. in the end, those are hobbies for rich people. I admit my bias, so maybe my assessment is wrong. my perspective is that, while a mountain bike with a motor sounds like fun, it's an expensive novelty to me. I'd ride one if someone gave me one, but I have what I think is an above average salary that I could not use to justify the purchase and maintenance of such a thing. I just want to ride and dealing with a motor does not sound like fun. I can't even bring myself to put a derailer on my bike.
  16. No one is bashing emtbs. Sure they're fun! Just saying that the demand is probably not going to be as high as manufactures are betting on. I don't think enough people can afford them to justify the race to put so much energy into making so many of them.
  17. this has been what's worrying me. there was an interview — I think it was posted here a while back — where a bike company exec said specifically that they are focusing all their engineering and marketing on e-mtbs with the expectation that most of their sales will be e-mtb in a few years, and that acoustic bikes will become a novelty. not e-bikes in general, but e-mtbs. there are some places and instances where an e-mtb makes perfect sense (shuttling in mountainous places, people with limited physical abilities, trail tool hauling, just for fun) but there's no way there will be sustained demand for that kind of thing on the long run due to cost of buying and maintaining these things. most people cannot afford a nice bicycle, let alone something that costs even more with a more and a battery. certainly not enough to maintain the level of commitment that some manufacturers are putting into it. we all know that's going to crash at some point. I could be wrong, but it seems unsustainable. however, e-bikes that replace cars for getting around town is 100% going to blow up, in a good way, and I am 100% behind that. fewer cars, more butts on bikes, demand for better bike infrastructure, less overall pollution. yes please.
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