Why do some forks and frames have brake rotor size limits?
On 2017-10-27 09:43, Frank Krygowski wrote:
On 10/27/2017 4:34 AM, John B. wrote: On Wed, 25 Oct 2017 08:59:46 -0700 (PDT), wrote: I see no reason whatsoever for disk brakes and their complications even on most MTB's since a good V-Brake is longer lasting, just as effective, cheaper and doesn't require special wheels and frame and fork changes. Well, "cause I want 'em" is, I guess, a valid reason. But not necessarily proof of superiority :-) "I want 'em" is the ultimate decision point for lots and lots of consumer goods. Of course, people learn to "want them" after consuming tons of advertising bull****. I guess it keeps our economy going. What really keeps the economy going is the "need it" because repeated ads have told the consumer that life would just be miserable without. That is how people who rarely use such a product enough get suckered into expensive cell phone plans, cable TV subscriptions, a new car every 2-3 years, and so on. That goes for cyclists as well. I know a guy who bought a $7500 carbon deal and after more than half a decade has 10 miles on it. A $300 Walmart road bike would have been perfectly fine for him. -- Regards, Joerg http://www.analogconsultants.com/ |
Why do some forks and frames have brake rotor size limits?
On Fri, 27 Oct 2017 15:53:31 +0700, John B.
wrote: At the copper mine, in Irian Jaya, the trucks and busses that ran from the base camp up to the tramway, that made the final jump up the mine, were all equipped with "Jacobs Brakes" which used the engine compression to reduce speed. https://en.wikipedia.org/wiki/Compression_release_engine_brake Ugh, don't remind me. I was going to college at Cal Poly, Pomona and living in a dormitory located at the base of Kellogg Hill. Going over the top of the hill was the San Bernardino Freeway. The slope was steep enough that trucks had to use secondary braking to slow down. At any hour of the day, a series of small explosions would be heard as the trucks descended down Kellogg Hill: https://archive.is/20130127022926/http://jake-brakes.com/about-us/noise-concerns.php https://www.youtube.com/watch?v=a8PDO6tbVtw (first few seconds as he slows the truck down). -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Why do some forks and frames have brake rotor size limits?
On Sunday, October 22, 2017 at 2:12:18 PM UTC-7, Ian Field wrote:
"Joerg" wrote in message ... When researching upgrades to larger rotors I read that there may be limits for frames and forks. Why? Explanations were usually scant and contradictory, with some saying it doesn't matter and some saying it does. After all, when increasing the rotor diameter by a couple of inches the brake force on the caliper goes down by about 30% and then due to it being positioned farther out this should cantilever back into the same +30% into the frame or fork bosses as before. The maximum deceleration achievable on each wheel remains the same, until it is very close to locking up. So it should be a wash, shouldn't it? Bicycle brake rotors are pretty thin and fragile - the bigger you make it; the more vulnerable it is. Sounds like Nicki Minaj. The more you spend it, the faster it go. |
Why do some forks and frames have brake rotor size limits?
At the copper mine, in Irian Jaya, the trucks and busses that ran from the base camp up to the tramway, that made the final jump up the mine, were all equipped with "Jacobs Brakes" which used the engine compression to reduce speed. https://en.wikipedia.org/wiki/Grasberg_mine |
Why do some forks and frames have brake rotor size limits?
On Friday, October 27, 2017 at 7:51:11 AM UTC-7, wrote:
On Thursday, October 26, 2017 at 6:19:48 PM UTC-7, Tim McNamara wrote: On Thu, 26 Oct 2017 13:22:07 -0400, Frank Krygowski wrote: And ISTM that this is yet another example of "safety inflation." For decades and decades, cyclists rode in all weather using caliper brakes. They removed their hands from the brake levers to shift gears.. They rode at night using halogen or even vacuum headlight bulbs powered by dynamos, and in daylight with no lights at all. They had shoes without custom attachments to the pedals. They wore cloth caps, or no caps at all. They rode wearing clothing with natural, non-blinding colors. Now every one of those practices is portrayed by some as scandalously risky. Sheesh! Careful, Frank! Someone will confuse you with a conservative. Although these days even the "new conservatives" are no longer conservative. They're just mad that their lives suck, looking for some payback and usually blaming the wrong people. Principled actual conservatives are sadly becoming rara aves. A liberal is a conservative who wants everyone every to act in such a manner so as to sooth his own conscious. He wants laws passed to force everyone else to pay for charitable causes but in such a way that he himself need not. I'm sure you read Frank's response to a woman buying a pound and a half of hamburger for $15. "I'd tell her to shop at a different store." The soft heart of liberalism. A liberal is someone who is responsible for your well-being: FDR (Social Security), LBJ (Medicare) and Jimmy Carter (Revenue Act of 1978/IRC 401K). Without liberals, you'd be living under a bridge. Maybe it would be a super-nice Republican bridge, but a bridge nonetheless. -- Jay Beattie. |
Why do some forks and frames have brake rotor size limits?
On 10/27/2017 4:04 PM, jbeattie wrote:
On Friday, October 27, 2017 at 7:51:11 AM UTC-7, wrote: On Thursday, October 26, 2017 at 6:19:48 PM UTC-7, Tim McNamara wrote: On Thu, 26 Oct 2017 13:22:07 -0400, Frank Krygowski wrote: And ISTM that this is yet another example of "safety inflation." For decades and decades, cyclists rode in all weather using caliper brakes. They removed their hands from the brake levers to shift gears. They rode at night using halogen or even vacuum headlight bulbs powered by dynamos, and in daylight with no lights at all. They had shoes without custom attachments to the pedals. They wore cloth caps, or no caps at all. They rode wearing clothing with natural, non-blinding colors. Now every one of those practices is portrayed by some as scandalously risky. Sheesh! Careful, Frank! Someone will confuse you with a conservative. Although these days even the "new conservatives" are no longer conservative. They're just mad that their lives suck, looking for some payback and usually blaming the wrong people. Principled actual conservatives are sadly becoming rara aves. A liberal is a conservative who wants everyone every to act in such a manner so as to sooth his own conscious. He wants laws passed to force everyone else to pay for charitable causes but in such a way that he himself need not. I'm sure you read Frank's response to a woman buying a pound and a half of hamburger for $15. "I'd tell her to shop at a different store." The soft heart of liberalism. A liberal is someone who is responsible for your well-being: FDR (Social Security), LBJ (Medicare) and Jimmy Carter (Revenue Act of 1978/IRC 401K). Without liberals, you'd be living under a bridge. Maybe it would be a super-nice Republican bridge, but a bridge nonetheless. "The law, in its majestic equality, forbids the rich as well as the poor to sleep under bridges." -- - Frank Krygowski |
Why do some forks and frames have brake rotor size limits?
On Friday, October 27, 2017 at 9:39:06 AM UTC-7, Frank Krygowski wrote:
On 10/27/2017 11:06 AM, wrote: On Friday, October 27, 2017 at 1:24:49 AM UTC-7, John B. wrote: I've never been "doored", perhaps because if I have to ride past a line of parked cars where a door might be opened I either slow down or ride further enough away that a door wouldn't hit me. Here the bike lane can be so narrow that the car door on a two-door totally covers the lane and there's no place to dodge because passing cars will spot that and not let you out. In my experience, the trick is to plan ahead. If I've got to move left to avoid parked cars, etc. I tend to do it earlier rather than later. And it may be different in other places, I suppose. (Over the years, we've heard lots of "But the drivers HERE are really mean!") But the shopping trip I make almost daily by bike has me leaving the store on a street that's wide enough to share for about one block; then it gets narrow. I stay to the right for the first part, but move left for the narrow part. It sometimes involves looking over my shoulder at the next motorist and signaling left to sort of negotiate; but I can't recall a time when I wasn't allowed to merge left. Sometimes I have to be a bit pushy. Riding in downtown Pittsburgh a few weeks ago I came to an oddball intersection. (Pittsburgh has many.) I had to turn right then immediately move into a left turn lane at a traffic light. A woman driving an SUV from the opposite direction wanted to turn left into the same space I was using, and she tried to intimidate me into staying at the curb. I just looked at her and kept my path, and she stayed back. Of course, when the light finally turned green and our ways parted, she blared her horn. Because, you know, it was SO frustrating to have to sit behind a bicycle, instead of being ten feet further ahead at the traffic light! Exactly how do you plan ahead for someone opening their door? Especially these days when people will pull over to consult their cell phones and then drive off again? And narrow bike lanes in heavy traffic always brings out the jerk in drivers. Yesterday I was almost hit by two drivers as I was pulling across a three lane into the left turn lane when there was a red light for them and they could see me crossing. I have so much less problems with long haul truckers who know the rules and know that losing 5 seconds here means nothing. |
Why do some forks and frames have brake rotor size limits?
On Thursday, October 26, 2017 at 4:50:35 PM UTC-7, Joerg wrote:
On 2017-10-26 10:43, wrote: On Thursday, October 26, 2017 at 10:37:02 AM UTC-7, Radey Shouman wrote: Joerg writes: On 2017-10-24 17:21, John B. wrote: On Tue, 24 Oct 2017 11:47:12 -0700, Joerg wrote: [ ... ] The reason can be summed up in one word: Rain :-) But last Sunday I started out my "weekend" ride in the rain. It had been raining nearly all night and the roads had a lot of water on them - note we have been having floods here in Bangkok lately - but it appeared that the rain was ending so off I went. Unfortunately my weather forecasting facility wasn't working very well and I rode 20 Km of a 30 Km ride in light rain and flooded roads in many places. I was splashing through water in some places and cars were splashing through (and splashing me) in others. Of course, Sunday is much lighter traffic then on work days but still, Bangkok is rated as one of the cities with the most chaotic traffic in the world, and I did have to stop suddenly several time, on flooded roads with wet wheels and brakes. My brakes worked just as they do in the dry. Back brake stops me somewhat slowly and front brake stops rather suddenly, both brakes together provides best stopping. No long wait after grabbing a brake lever although I did think of you with your stopping problems and I have the feeling that the brake lever pressure might be a tiny bit more to stop in the rain but if it was it was so little that it couldn't be quantified. But of course I am using quality brake pads. Why it costs me US$12.12 a wheel just for pads alone.... but they do last a year or more. It seems Californian rain and Thai rain aren't the same. When it rains heavily and I have to do a surprise emergency stop after not having used the brakes for a while there is 1-2sec of nada, absolutely nothing. It makes no difference whatsoever whether I use $17 high-falutin Koolstop rain-rated pads or $4 Clarks pads. The experience of other riders around here and in this NG is similar. I don't understand the difference myself. When it's really raining, meaning there's a continuous film of water on the road and a rooster tail shooting forward off the front tire, I ride like a little old lady, because of the delay in braking. Especially when it's dark, and leaves and other blown down crap cover the road. Sometimes one has to reach a destination on schedule and slowing down to little old lady speed isn't always in the cards. That's why I prefer my MTB on rainy days. It is slightly slower than the road bike but the brakes are unfazed by rain. They are noisy in the rain though. I am with you that a super strong brake hardly seems the thing you want in rain. Not strong but I want a brake that comes on the instant I want it to, not 1-2sec later. I also found that I can reach in much harder on my MTB with the knobby tires in rain than I can with he slicks on the road bike. Just not when there is a road biker right behind me ... -- Regards, Joerg http://www.analogconsultants.com/ Bil Cosby |
Why do some forks and frames have brake rotor size limits?
On Friday, October 27, 2017 at 9:59:47 AM UTC-4, Joerg wrote:
Snipped Oh yeah, now we have to wash out bikes after each rain ride. Standing out there in the rain with sponge and shampoo. Great. -- Regards, Joerg http://www.analogconsultants.com/ Interesting that you do NOT want to do even basic maintenance/care of your bicycle. You much prefer to leave things go until something breaks ordoesn't work right; becaue it gives you something to complain about on Usenet. Sheesh! Cheers |
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