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Downtube folding bike

Old 11-13-06, 01:46 PM
  #776  
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Front Derailleur

Yan's post made me scratch my head and wonder what I was seeing wrong in my planned FD project, since I had measured 1 1/4 tube, a standard derailleur size. Well, it is obvious now that I look at it again: I was looking at the wrong tube - the angular one in front of the seat tube. However, now that I checked more closely, that won't put the FD in the right place to operate. I would have discovered this as soon as I tried to put it all together... so next time I'll wait to post until *after* the project is complete, in order to avoid inserting foot in mouth

Anyway, the next option I'm considering is one of those braze-on mount front deraillurs, then doing some kind of homebrew clamp for it (or, maybe I'll get lucky and find one of the right size...)

I will post again if/when I make it happen.

Maunakea - cool ride. I'd love to do that kind of thing to mine, but have too many other bike projects sucking up the money right now..... Would you be interested in posting a close-up pic of how you hacked your FD to fit?

Morgan
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Old 11-13-06, 03:04 PM
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Morgan, my frame is a 2005, so the 34.9 mm FD clamp fits.
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Old 11-13-06, 11:08 PM
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Originally Posted by downtube
I addressed the FD question in this thread a long time ago. Our 2005 and 2006 FS frames would accept a 35.0mm FD. However, our 2006 1/2 FS frames use oversized tubing. They will not allow a FD.
What is a diameter of the seat tubes on the DT IX (front suspension) and IX NS (no suspension) models? Do these models accept a FD?

What is a diameter of the top steering tube (just below a stem)?

On a page for the DT 9 speed NS , specification for the cassette is 11-12-14-16-18-21-24-28, that is only 8 speed (and the name of the page is ...VIIINS). What is the actuall cassette on the IX NS?

What is the difference between IX (front suspension) and IX NS (except the suspension and the pedals)? Why is the NS more expensive?

Thanks.
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Old 11-14-06, 01:44 AM
  #779  
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Seat tubes are 27.2. I believe the NS is more expensive because it comes with fenders while the IX does not.

Pretty sure this is the cassette (was on the IX page): 11-12-14-16-18-21-24-28-32

Hope that helps!
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Old 11-14-06, 05:38 AM
  #780  
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DT FS Photos w/ Topeak Rack Bag Panners

This link should be easier to access. Photo album name is Topeak Rig.

https://photos.yahoo.com/rpgruber@swbell.net

Please let me know if you have any problems accessing....

Later,

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Old 11-14-06, 06:28 AM
  #781  
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Originally Posted by Air
Seat tubes are 27.2. I believe the NS is more expensive because it comes with fenders while the IX does not.

Pretty sure this is the cassette (was on the IX page): 11-12-14-16-18-21-24-28-32

Hope that helps!
I think Yan had posted earlier that the NS is more expensive because the frame is a higher grade aluminum and is lighter.
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Old 11-15-06, 09:45 AM
  #782  
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Originally Posted by SesameCrunch
I think Yan had posted earlier that the NS is more expensive because the frame is a higher grade aluminum and is lighter.
The only difference is the fork. The alloy fork on the NS costs much more than the suspension fork on the IX. No other companies spec an alloy fork.....look around.

Thanks,
Yan
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Old 11-15-06, 01:37 PM
  #783  
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Yan's right, you can get the zoom suspension forks for 9-20 bucks from Gaerlan I believe.
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Old 11-16-06, 01:28 PM
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This is my first post here. I have a Downtube VI and a Downtube VIII, the older version, with just the frong supension, and a 1996 Trek comfort bike. I really love the Downtube bikes. I was going to put out the money for a Dahon, but the reach between the seat and the handlebar is just too far for me to be comfortable no matter how high or low I put the bar. And the Downtube is a much better value. I'm glad I didn't get the Dahon because it would just be sitting aroun unridden.

The VI is a blast to ride. I replaced the 14-28 freewheel with a 13-34 for the hills around here. But it was just too heavy for me to lug arounf with my back problems, so I got a VIII when they came out.

Other than putting some blinkie lgihts and a handlebar bag on it, the only modification is a bunch of parts from various places sitting in a box. I have a SRAM X7 9-spped drivetrain with a 11-34 cassette ready to install, but I probably won't do it until spring.

For anyone getting a downtube, I would advise going for the 9-spped option as I couldn't do it for $30 even with getting everything on sale (the shifter, derailleur, cassette and chain from various auctions and sales came to about 90 bucks), and who knows when you might need that extra gear because of big hills or getting older (I'm sixty and overweight).

My question is, and maybe Yan knows this, if I buy a Mini and the handlebar height is wrong for me, can I remove the whole folding stem assembly from the VI and fit it on the Mini, or would it not fit?

Also, as I understand it the hub only comes with a 23- or 25-tooth cog, and I wonder which the mini has?

And one other, I really do want an internal hub bike for around here (north of Seattle) so if I didn't get the Mini, do you have any ideas on lowering the gearing on the larger hub bike? The gearing is just way too high for me.

Thanks
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Old 11-16-06, 01:39 PM
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Originally Posted by flyingwolf
This is my first post here. I have a Downtube VI and a Downtube VIII, the older version, with just the frong supension, and a 1996 Trek comfort bike. I really love the Downtube bikes. I was going to put out the money for a Dahon, but the reach between the seat and the handlebar is just too far for me to be comfortable no matter how high or low I put the bar. And the Downtube is a much better value. I'm glad I didn't get the Dahon because it would just be sitting aroun unridden.

The VI is a blast to ride. I replaced the 14-28 freewheel with a 13-34 for the hills around here. But it was just too heavy for me to lug arounf with my back problems, so I got a VIII when they came out.

Other than putting some blinkie lgihts and a handlebar bag on it, the only modification is a bunch of parts from various places sitting in a box. I have a SRAM X7 9-spped drivetrain with a 11-34 cassette ready to install, but I probably won't do it until spring.

For anyone getting a downtube, I would advise going for the 9-spped option as I couldn't do it for $30 even with getting everything on sale (the shifter, derailleur, cassette and chain from various auctions and sales came to about 90 bucks), and who knows when you might need that extra gear because of big hills or getting older (I'm sixty and overweight).

My question is, and maybe Yan knows this, if I buy a Mini and the handlebar height is wrong for me, can I remove the whole folding stem assembly from the VI and fit it on the Mini, or would it not fit?

Also, as I understand it the hub only comes with a 23- or 25-tooth cog, and I wonder which the mini has?

And one other, I really do want an internal hub bike for around here (north of Seattle) so if I didn't get the Mini, do you have any ideas on lowering the gearing on the larger hub bike? The gearing is just way too high for me.

Thanks
flyingwolf
I don't know if you can change the DT stem from from the 20" to the but I put a Dahon 1 1/8 Quill Extender Stem (49.95) and Revolve Stem w/ Quick Release Top (19.25) on my Mini to get the adjustment I needed. The quick release top helps you get a flatter fold as well.

Here's a link to ThorUSA for the parts: https://www.thorusa.com/dahonhandlebar.htm

The Mini has the 23T sprocket as does the VIIIH. See this thread for an in depth review of the SA hub and gearing on the VIIIH: https://www.bikeforums.net/folding-bikes/215537-review-my-downtube-viiih-internal-hub-long-review.html

You will likely find the gearing on the Mini is fine with the SA 8 speed hub. I also have the VIIIH 20" and the SA hub gears are too tall on this bike. You will want to change to the 25 tooth rear sprocket and may want to down size the front as well. Wavshrdr does a better job of explaining this and making recommendations than I can.

Good luck. Let us know what you decide to do on the gears and how it turns out.

Last edited by Polaris43; 11-16-06 at 02:02 PM.
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Old 11-16-06, 04:57 PM
  #786  
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Originally Posted by flyingwolf
This is my first post here. I have a Downtube VI and a Downtube VIII, the older version, with just the frong supension, and a 1996 Trek comfort bike.

My question is, and maybe Yan knows this, if I buy a Mini and the handlebar height is wrong for me, can I remove the whole folding stem assembly from the VI and fit it on the Mini, or would it not fit?


Thanks
flyingwolf
Wow you have a VI! Soooo cool, I have one left. The swap will work, however it will make the mini heavy and clumsy to fold. I like the above solution better.

Thanks,
Yan
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Old 11-17-06, 11:39 AM
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Originally Posted by flyingwolf
For anyone getting a downtube, I would advise going for the 9-spped option as I couldn't do it for $30 even with getting everything on sale (the shifter, derailleur, cassette and chain from various auctions and
Flyingwolf: PS, having a 9speed doesn't really give you any more gear range (ie, make hills easier), it just makes the difference between gears a little smaller. You can find 8 speed cassettes with same range as 9 speeds.
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Old 11-17-06, 01:34 PM
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Thanks for the advice. Those Dahon parts look like a good solution. Then all I'd need is a Bike Friday part and I'd have a Downfryhon!

Yes, I know an 11-34 is the same rang whether 8- or 9-speed. My problem was that I took the one off the Trek and tried to put it on the Downtube and I couldn't get it to work with the derailleur that was on there, an older Sunrace. Maybe a good mechanic could have gotten it to work but it was beyond me. Since I wanted the part back on my Trek I needed a new derailleur and cassette, so I figured why not just go to a nine-spped if I could find a cheap shifter and chain? The newer VIII use a different derailleur so maybe an 11-34 would be easier to fit.

Yes, the VI is a cool bike in spite of its weight. Red paint really looks good on a Downtube, and even though people say that cassettes are better than freewheels, I've never had any trouble with it at all.

flyingwolf
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Old 11-18-06, 12:25 PM
  #789  
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Quando rear hubs

What are your experiences with the Quando rear hub?

Both my DTs have very sluggish rear wheels. When I spin them (with moderate force) they don't go more than 4 or 5 revolutions. The 2005 VIII FS spins like it's in molasses. Even the 1 week old 2006 rear wheel is less than inspiring.

Are you guys seeing the same thing, or am I just extra lucky?
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Old 11-18-06, 04:04 PM
  #790  
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I also noticed the rear wheel was much slower than the front wheel, when spun in open air - but I don't know whether this affects the bike when there's more weight on it. I think friction can have a sort of breaking point, so that once the force applied to moving the bike (through gravity, weight, inertia, etc) is strong enough, the force slowing the wheel down actually becomes less. It seems to me like the Mini can coast forever, when I'm riding it, but yes, it doesn't spin far in the open air.
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Old 11-18-06, 04:18 PM
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Originally Posted by dcoli
I also noticed the rear wheel was much slower than the front wheel, when spun in open air - but I don't know whether this affects the bike when there's more weight on it. I think friction can have a sort of breaking point, so that once the force applied to moving the bike (through gravity, weight, inertia, etc) is strong enough, the force slowing the wheel down actually becomes less. It seems to me like the Mini can coast forever, when I'm riding it, but yes, it doesn't spin far in the open air.
Well, I hope you're right about the friction thing. But, I do know when I spin my 700 Bontrager Race-Lites they go around forever....
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Old 11-18-06, 05:18 PM
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My Quando hubs seem fine. Just pull the wheels and spin the axles in your fingers. If you feel any crunching, the cones are probably too tight. If you've never adjusted cones, just take it into your LBS. Make sure to check the spoke tension and true of the wheel (whether it wobbles). Your brakes could be periodically hitting the uneven rim.
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Old 11-19-06, 01:07 AM
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Here's a "pro" toolkit under the Lifu brand for $35.
https://www.pricepoint.com/detail/119...ontool-Kit.htm
currently $50 at NB.
The Lifu kit contents differ in minor ways from the NB kit, and include an adjustable wrench and a lockring spanner. Quality is about the same in both.

Last edited by maunakea; 11-19-06 at 01:13 AM.
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Old 11-19-06, 07:56 AM
  #794  
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Out of my 3 Downtube bikes, 2 of the quando hubs came over tightened. I had to loosen them up just a hair, and now they spin fine. They're not the highest-quality hub, but they work fine if you get them adjusted properly...

Morgan
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Old 11-19-06, 08:42 AM
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Originally Posted by mcgurme
Out of my 3 Downtube bikes, 2 of the quando hubs came over tightened. I had to loosen them up just a hair, and now they spin fine. They're not the highest-quality hub, but they work fine if you get them adjusted properly...

Morgan
That's very helpful to know. The hub on the 2005 does feel a little "crunchy" to me. I'll loosen it a tad and see if that helps. Did you open up and grease the ball bearings as well?
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Old 11-19-06, 03:10 PM
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Hi
I didn't open them all the way up, because they spun smoothly once I backed off the bearing cone a bit, and I figured that I might as well not risk getting dust in there (which is a pain). Based on how smoothly they spin now, I think the grease is probably ok. But in about a year or so, I'll definitely check it.

Morgan
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Old 11-20-06, 01:48 PM
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Introducing - my first (two) folding bikes:

- 2006 1/2 IX front suspension. Heavily modified to be my " portable roadie". Full SRAM X.7 drivetrain, teflon cables, Velocity wheels, 130mm stem, front disc brakes, new saddle, new BB and FSA carbon crank. Took it for a 40 mile ride with my group yesterday. Rides very well, rolls smooooth, stable downhills 40+ mph. (I did feel the weight uphills compared to my carbon bike, which is 17lbs ) . I am VERY impressed with the SRAM drivetrain - almost as good as the DuraAce stuff on my Fuji. The riding position is now dialed in and very comfy, although the seat post is about a half inch too short for ideal extension. I still have some problems with the chainline, with drops off the front chainring sometimes - will continue work on that. I also wish now that I had gotten the Non-Suspension model since the ride on 20" wheels is not as bad as I thought it was going to be. Oh well, next time.



- 2005 VIII Full Suspension. I took all the parts removed from the other bike and put it on this one. So now it is configured like a 2006 IX FS. There is a huge difference in general component quality between the two years. It inherited the M90 9 speed drivetrain, 11X34 cassette, stem, cranks, and a sealed BB. It's set up to be a comfy riding bike for my wife and for occasional off-road rides on fire trails and such. I took it for a 2.5 hour ride up the Marin headlands in the SF area. Beautiful first ride! Bike performed very well. It was fun beating people up the hills on these 20" wheels, heh, heh.



Thanks to all of you for your help in indoctrinating me to this whole new world of biking. I know I'm having too much fun when my wife starts complaining about how much time I'm spending in the garage
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Old 11-20-06, 10:48 PM
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Originally Posted by barneybarney
however i do have a consistant problem with the chain being thrown at the front chain ring (by the peddles) when i change to 8th/9th. this now happens several times each time i take the bike out for a ride and its beginning to take the shine of the experience. Does anyone else have the same prob or know how to fix this?
barney
Barney: Did you ever resolve this chain drop problem? I have the same issue right now. I think my chainline is good. I'm wondering if it's a loose chain.
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Old 11-21-06, 07:12 AM
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I was having the same problem on my IX FS (2006 1/2).

The first thing I found, that reduced but not eliminated the problem, was that my hangar was ever so slightly bent. Once I got it aligned perfectly, the skipping reduced. My chain tension was fine, but I was still having this. Also, I noticed that using a very light/dry lube helped a lot.

But then I got really serious about never having it happen again. For $30, I had the guy who runs Gaerlan build me one of his "orange roller" gizmos, that rides on the chain in place of a front derailleur, and it keeps the chain on perfectly. It looks a bit funny, but works really well. If anyone here decides to order one, tell him to make the clamp slightly larger diameter than he did for me - I had to do a bit of bending to get it to fit. But other than that, it works great.

Next in my plan is still to try a front derailleur, but not sure when I'll have time now, given another major bike restoration going on (a handmade '92 Fat Chance Yo Eddy, for anyone who cares...)

Morgan
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Old 11-21-06, 07:49 AM
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Morgan:

Thanks for the roller idea. It does look a little consipicuous up there, doesn't it? I think I may go ahead and look into fitting a front derailleur on. Might as well get full functionality.

Happy riding.
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