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#21
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Bike Friday for a touring bike?
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#22
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Bike Friday for a touring bike?
In article ,
James Thomson wrote: "David" wrote: They bent your chain ring and yet your front derailleur survived? Easy to imagine. The lower part of the chainring is relatively exposed, and not close to the front derailleur. It requires quite a bit of force to bent a chain ring and it's odd to have only concentrated on the chain ring when the frame is more exposed than the ring. Just unlucky I guess? I have heard more about bent frames, dented tubes (those thin Columbus Foco) and stuff, including one of the stachion tubes of my Marzocchi Z.3 BAM light fork when the now deceased Royal Airlines (a Canadian carrier) damaged it while coming back from the big island. With the Bike Friday and a Sachs 3x7 or a 3x9 hub, even if the rear derailleur got snapped off, all I have to do is shorten the chain to make it a single speed bike with a 7 or 9 speed internal hub still intact. The epicyclic part of the hub is a three-speed. The cassette body takes seven or (eight or) nine sprockets. Thank you for correcting the error. You are indeed correct. But still, a 3 speed bike is better than no speed at all. I remember that in the old days, youth hostel tourers ride on 3 speeders!! |
#23
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Bike Friday for a touring bike?
In article ,
wrote: With the Bike Friday and a Sachs 3x7 or a 3x9 hub, even if the rear derailleur got snapped off, all I have to do is shorten the chain to make it a single speed bike with a 7 or 9 speed internal hub still intact. If I do decide to go for a Bike Friday.....Im definitely gonna go for the internal geared rear hub. Is that a good idea in your mind?? While I am no expert with gearing, I always believe that with a 20" bike, you really have no choice but to go with an internal geared hub to attain a workable gear ratio. The hub on my Friday works great and has never let me down. I ofcourse have a mechanic service it before I go on any major bike trip. |
#24
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Bike Friday for a touring bike?
Smaller (e.g. 20") wheels translate much more surface bumpiness into vertical motion at the axle. They fall deeper into holes and are less capable of rolling out. At any given tire width, they sink more into soft surfaces than larger diameter wheels and offer less directional control under those circumstances. Their tires have noticeably more rolling resistance and wear out more quickly than larger ones. If pressures are lowered to moderate the ride quality shortcomings of small wheels, rolling resistance climbs even more. The smaller the wheel, the easier it is to pinch the tube (other factors equal). This imposes a limit on minimum pressure which is higher than for a larger diameter wheel. Small wheels are stronger and lighter than large ones, and make bicycles much easier to pack and transport. Still, I don't think this makes up for their limitations except under circumstances dictated by travel arrangements. What I found to mitigate the problem is to use a smooth fat tire on the front with a max pressure of 50 psi (The Haro Ninja) and at the rear, I use a Primo Comet with a max pressure of 110 psi. I ride a Brooks with a Rockshox suspension seatpost to smooth out the bumps on the rear due to the high tire pressure I use. This is the setup I use to tour and have found to be just as comfortable as my full sized touring bike. I certainly would not take it off-road though. |
#25
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Bike Friday for a touring bike?
Sheldon Brown wrote in message ...
Chalo Colina wrote: You can get ISO 406 (20" BMX) tires in many grocery stores and all Walmarts. They are as broadly available as ISO 559 (26" MTB) if not more so, and way more available than ISO 622 (700c). An anonymous poster sniped: There are no Walmarts in Europe. Carrefour! Chalo is correct if the bike in question had the commmon-as-dirt 406 mm size. Unfortunately, _some_ Bike Fridays use the much harder-to-find 451 mm size. I would agree that 451 is a very poor choice for touring, but that 406 is a good choice if speed is not a major priority. I don't think there is any other tire size in existence that is as widely available as 406. Sheldon "Ubiquity" Brown When I was riding in France last summer, I had a stupid day where I left some of my things in a friends car (I was with him for a couple of days, and then going off unsuported) including my flat kit... I got a flat at the beginning of the day, on a Sunday afternoon in the middle of the Pyranees, and after help from a fellow cyclist in the form of a glueless patch, eventually found an open bike shop, but they had no large 622 tubes.... Mostly mountain biking in that region, from that shop. I don't know what the lesson is, but no matter what size you have, carry your own spares!! Whitfit. |
#26
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Bike Friday for a touring bike?
On Fri, 18 Jul 2003, David wrote: If I do decide to go for a Bike Friday.....Im definitely gonna go for the internal geared rear hub. Is that a good idea in your mind?? While I am no expert with gearing, I always believe that with a 20" bike, you really have no choice but to go with an internal geared hub to attain a workable gear ratio. The hub on my Friday works great and has never let me down. I ofcourse have a mechanic service it before I go on any major bike trip. Moultons www.moultoneers.net have used small rear cogs for ~20 years now to get a normal range of road gears. Shimano has recently "validated" this concept with their new small-wheel Capreo group, the 9-speed cassette starts at 9 teeth for top gear. |
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