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If you do try a kickback, I’d urge you to use one without a coaster brake – on my MB-2 Resurrectio, I used a 2-speed Sturmey Archer kickback with a coaster brake, and the braking results in shifting when I don’t want it to. Otherwise I like the kickback hub a lot.
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If you do try a kickback, I’d urge you to use one without a coaster brake – on my MB-2 Resurrectio, I used a 2-speed Sturmey Archer kickback with a coaster brake, and the braking results in shifting when I don’t want it to. Otherwise I like the kickback hub a lot.
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com] On Behalf Of Matthew J
Sent: Wednesday, December 17, 2014 9:28 AM
To: rbw-owne...@googlegroups.com
Subject: [RBW] Re: What's your winter project?
Finally going to try out a kick back hub for an urban porteur. Should be on the streets around February.
On Wednesday, December 17, 2014 4:37:11 AM UTC-6, ascpgh wrote:Riding, besides my commutes, get a bit scant from here on out through winter. The season, the holidays, more deliberate prep for a trip in the conditions, plenty of things distract from just a nice ride but I realize that at this time every year I always seem to contemplate a bike project to go with the anticipated springtime, fruition or not. It's biking fun for the extra bandwidth.
My project is a low trail, 650b wheeled, all-around bike made with a lively tube set (versus sturdy for touring) with drop bars, center pull brakes, generator hub, LED lighting. All on a budget recognizing the value of experience, unlike the box bike/mass market interpretation, handmade wheels versus machine made ones as an example. I am reading and including many posting subjects and items in this project and admit that may not reach reality, but it's fun to have on the drawing board.
Andy Cheatham
Pittsburgh
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1. Another mixte rebuild for a charity auction. This one is a Fuji Royale mixte (from, I think, 1981); quite a nice frame, repainted by Bruce at the Color Factory a tasteful Taxicab Yellow. It will get the same build as in past years – 3-speed Sturmey drum brake rear and Sturmey drum brake front, laced to Ghisallo wooden rims in 650B, upright bars, and some kind of fancy chainguard and basket. These builds have enough whiz-bang to them that they fetch good bids, and sometimes bidding wars. And I have the problems worked out with these builds, so other than lacing the wheels, they don’t take me too long.
2. Finish the build on my S&S coupled Saluki, and get comfortable packing and unpacking it.
3. I have two bikes that have been off the road for minor repairs or updates for nearly a year – time to get to them this winter. My Bombadil gets a new Luxos set-up, and some new grips. The Mystery Bike took a fall, and needs a new cork grip; while I’m at it I’ll change the brake levers and install a basket on the Mark’s rack.
4. The downtube shifter thread has me curious – I’ve never ridden a downtube shifter-equipped bike. So an old and somewhat beat-up but perfectly sound Gitane Tour de France with downtubers will move up in the queue – good to have a beater road bike, and it’s a snazzy purple color with foil decals, so, hey!
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com]
On Behalf Of Matthew J
Sent: Wednesday, December 17, 2014 9:28 AM
To: rbw-owne...@googlegroups.com
Subject: [RBW] Re: What's your winter project?
Finally going to try out a kick back hub for an urban porteur. Should be on the streets around February.
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Tig welding and lugs are methods or joining tubes. If the tubes and angles are the same as long as the joining is done well it will not make much difference on ride and handling.
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I am doing the same conversion! The 1983 Trek 620 is the last sport touring model year with side pull calipers, as far as I can tell. It is a nice frame, with decent clearance, though it looks like only 38mm tires with fenders will fit. I am still thinking about the wheels. I have some Mafac Raids and the rest of the parts.
My other winter project is building up a Betty Foy for my wife. It just arrived yesterday. That might happen before the Trek. It is a really nice frame, though there are a couple of paint imperfections that I was disappointed with. One is on the heart cutout detail at the top of the seat tube, so very noticeable. Oh well - it was one of the sale frames and really very nice overall.
I have figured out everything for the Betty Foy build except for the cranks. I have a sugino AT that would work well, but I was trying to work out chainring selection. I like the wide low double with chain guard that Riv sells, but can't find a chain guard for the 45 big ring size.
Toby
Toronto
I'm doing a 650B conversion of my '83 Trek 620, too much reading BQ, I guess. Parts are already on the way.I'm also thinking about ordering a custom Chinese titanium 29+ frame.
Eric
On Wed, Dec 17, 2014 at 5:37 AM, ascpgh <asc...@gmail.com> wrote:
Riding, besides my commutes, get a bit scant from here on out through winter. The season, the holidays, more deliberate prep for a trip in the conditions, plenty of things distract from just a nice ride but I realize that at this time every year I always seem to contemplate a bike project to go with the anticipated springtime, fruition or not. It's biking fun for the extra bandwidth.My project is a low trail, 650b wheeled, all-around bike made with a lively tube set (versus sturdy for touring) with drop bars, center pull brakes, generator hub, LED lighting. All on a budget recognizing the value of experience, unlike the box bike/mass market interpretation, handmade wheels versus machine made ones as an example. I am reading and including many posting subjects and items in this project and admit that may not reach reality, but it's fun to have on the drawing board.Andy CheathamPittsburgh
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One major project this Winter is to jump into the ring with a @#$%& crankset/BB overhaul, or changeout, or maybe a combination of the two. If anything in the world could use a bit of "standardization" it would be this business of trying to match up BB spindle tapers and length with "said" requirements for them published by those who pedal (no pun intended) various cranksets. On top of all that, I'm done with these so-called "self extracting" fixing bolts and going back to a good old crank puller that actually works.Enough of that rant - the next project will be to "boil" a piece of leather and let it dry on a cylindrical surface in order to shape it into a nicely curved mud flap. In order to keep in that way, I'm thinking of shellacking the tire side of the flap. Anyone know how well shellac works with leather?
Wow, Bill. That is an inspiring (and, for those like me who lack the imagination/skills to conceptualize such a thing, humbling) winter project. Pics along the way, please, please, please. And good luck!
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And now I’m off to Google “White LMDS”
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com]
On Behalf Of Bill Lindsay
Sent: Thursday, January 08, 2015 11:31 PM
To: rbw-owne...@googlegroups.com
Subject: [RBW] Re: What's your winter project?
OK, this might be the weirdest winter project I've ever taken on, but I did put in some serious design work today, and the concept is actually taking shape. This Winter project is that I am going to build my own desmodromic rear derailer.
What the heck is that? A desmodromic mechanism is something that is actively driven in all directions. The most well known desmodromic mechanism, and what you'll see if you Google the word "desmodromic" , is Ducati valves. A rotating cam throws the valve
open and another rotating cam throws it closed. There is no return spring. It's driven open and closed. Some classic old French derailers had a loop of cable that, like a push-me-pull-you, would drag the derailer to the left and to the right. The parallelogram
had no return spring. Much more recently, White Industries made a desmodromic shifting system, called the LMDS (Linear Motion Derailer System). Look it up, it's pretty swank.
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Wow, Bill. That is an inspiring (and, for those like me who lack the imagination/skills to conceptualize such a thing, humbling) winter project. Pics along the way, please, please, please. And good luck!
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com] On Behalf Of Bill Lindsay
Sent: Thursday, January 08, 2015 11:31 PM
To: rbw-owne...@googlegroups.com
Subject: [RBW] Re: What's your winter project?
OK, this might be the weirdest winter project I've ever taken on, but I did put in some serious design work today, and the concept is actually taking shape. This Winter project is that I am going to build my own desmodromic rear derailer. What the heck is that? A desmodromic mechanism is something that is actively driven in all directions. The most well known desmodromic mechanism, and what you'll see if you Google the word "desmodromic" , is Ducati valves. A rotating cam throws the valve open and another rotating cam throws it closed. There is no return spring. It's driven open and closed. Some classic old French derailers had a loop of cable that, like a push-me-pull-you, would drag the derailer to the left and to the right. The parallelogram had no return spring. Much more recently, White Industries made a desmodromic shifting system, called the LMDS (Linear Motion Derailer System). Look it up, it's pretty swank.
So, what I've got scoped out, is that I'm going to take my favorite stock rear derailer (RD-M760-GS low normal), remove the spring, and set it up for a secondary cable. The actuating mechanism of our modern derailers is a parallelogram with a pretty complex geometry. Those of us used to friction shifting with lots of gears can attest to the fact that the derailer responds differently at different places in the sweep of the shifter. For me the incredibly sensitive spot is dropping from the biggest cog on the cassette to the next one. You just touch the shifter and it moves. It's super sensitive. I did all the measurements and calculations and now the data tells me why. The geometry of the parallelogram demands it. So, I need a shifter with a profile that isn't round. It needs to be a profile that complements the geometry of the parallelogram of my derailer. Let's say you want to move the shifter 120 degrees to sweep all the way from cog 1 to cog 9. Then, ideally, you want every one of those 8 steps to be exactly 15 degrees of movement. With the right shifter profile, that's no problem, if you can do the math, then do the design, and then have a manufacturing method that can produce one of them. This is where 3D printing comes in.
The really complex math exercise that gets you to the shifter profile that pulls the RD-M760-GS in this direction gets repeated once you figure out where to put a secondary cable to pull the derailer in that direction. Those profiles need to also have the property that they counterbalance each other so you never get even a bit of slack in the cable, allowing you to actuate both cables with one shiftlever. Push me pull you. That's why White Industries made the LMDS on sliders. They at least made the derailer motion linear, and the cable motion linear, so the math wouldn't be so GNARLY.
Me, I don't plan on building a derailer, and I don't mind the math. Today I worked out the GNARLY math and have both cam profiles. I now need to strong arm my brother in law to translate my numbers into a solidworks model. Once that's done, it's trivial to 3D print this weird cammish shifter, and try to hook up a DIY desmodromic rear shifting system. The real key compnent is to modify an existing shifter design that has adjustable and equal friction in both directions and fits into a really small space. I'm going to base my design on this Cheapo Simplex model.
French AND Cheapo
If I can emulate that plastic inner shifter piece, but implement my optimal cam profile, and figure out a cable fixing mechanism to prevent slipping at the shifter, then getting it 3D printed is practically free.
Why do it? Well, Jan goes on and on how much the rest of the world wastes energy pushing against a spring to shift in this direction and having nothing to do with the shift in that direction because only the spring is doing it. I just wanted to see what it is he's fussing about. I don't want to buy a 1930s Singer or Herse for $15000, and I don't want to build a totally custom $20000 bike like Jan did, but I do want to explore. I don't even want to spend the $400 it takes to buy a WI LMDS on Ebay. But, if I can spend $50 and a number of hours exploring something in detail that I had previously just taken for granted, that amounts to a Winter project for me.
On Wednesday, December 17, 2014 at 2:37:11 AM UTC-8, ascpgh wrote:Riding, besides my commutes, get a bit scant from here on out through winter. The season, the holidays, more deliberate prep for a trip in the conditions, plenty of things distract from just a nice ride but I realize that at this time every year I always seem to contemplate a bike project to go with the anticipated springtime, fruition or not. It's biking fun for the extra bandwidth.
My project is a low trail, 650b wheeled, all-around bike made with a lively tube set (versus sturdy for touring) with drop bars, center pull brakes, generator hub, LED lighting. All on a budget recognizing the value of experience, unlike the box bike/mass market interpretation, handmade wheels versus machine made ones as an example. I am reading and including many posting subjects and items in this project and admit that may not reach reality, but it's fun to have on the drawing board.
Andy Cheatham
Pittsburgh
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Chris that looks awesome! I'll be interested in what you think of the fire xc tires!
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The Compass 26” tires are not Hetres, but have a lovely, supple ride and I would characterize them as road tires.
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com]
On Behalf Of Montclair BobbyB
Sent: Tuesday, January 13, 2015 12:46 PM
To: rbw-owne...@googlegroups.com
Subject: Re: [RBW] Re: What's your winter project?
Steve:
For starters there's Schwalbe Big Apple and Kojaks, which come in multiple widths, perfect for roadin'. And we are talking about a Rockhopper, which is made for fat tires.
Here's my son's Rockhopper with the biggest Fat Franks... Still rolls great on 50-mile roads and on all kinds of terrain. That said, I do wish the GB Hetres came in a 26... just sayin...
On Tuesday, January 13, 2015 at 12:08:42 PM UTC-5, Steve Palincsar wrote:
On 01/13/2015 11:20 AM, Montclair BobbyB wrote:
> Yeah, why bother with 650b when there are so many great tire options for 26"??
>
Because there are virtually no great road tire options for 26"?
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Steve
Does the Compass 26x1.75 tire qualify as GREAT with you?Does the Compass 26x1.5 tire qualify as GREAT with you?
In other words, does virtually no great tires mean Zero? Or One? Or Two?
When Tim said Grand Bois, I assumed he meant these two Compass models.
On Wednesday, January 14, 2015 at 2:10:55 PM UTC-8, Steve Palincsar wrote:On 01/14/2015 04:40 PM, Tim McNamara wrote:
On Jan 13, 2015, at 11:08 AM, Steve Palincsar <pal...@his.com> wrote:On 01/13/2015 11:20 AM, Montclair BobbyB wrote: Yeah, why bother with 650b when there are so many great tire options for 26"??Because there are virtually no great road tire options for 26"?Panaracer Pasela, Specialized, Grand Bois, Schwalbe... There are a bunch of good road tire options for 26" wheels.
There aren't any Grand Bois tires in 559 that I am aware of. As for the rest, yes certainly a bunch of good tires, but Bobby said great.
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Unfrozen caveman lawyer, everyone!
On Thu, Jan 15, 2015 at 11:29 AM, Bill Lindsay <tape...@gmail.com> wrote:
## Max Sarcasm Subroutine -INITIATE- ##
To bad, Bobby, despite what you have determined empirically, Steve trumps your data with his interpretation of what is in-between the lines of what Jan has written about tires. Steve says the subtext behind Jan's writings imply that Compass tires are the best 559 tires available, and they could be improved on. ERGO-not great, by definintion. CASE CLOSED.
## Max Sarcasm Subroutine -TERMINATE- ##
You are absolutely correct. I typed "To bad, Bobby," when obviously I should have typed "Too bad, Bobby". Thank you for your always constructive criticism.
“snarkometer” = genius
From: rbw-owne...@googlegroups.com [mailto:rbw-owne...@googlegroups.com]
On Behalf Of Montclair BobbyB
Sent: Friday, January 16, 2015 10:45 AM
To: rbw-owne...@googlegroups.com
Subject: Re: [RBW] Re: What's your winter project?
... that one damn near busted my 'snarkometer'... You're 'to' funny, Bill...
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