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Upgrading city gears for touring on a Dahon Wobbegong

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Upgrading city gears for touring on a Dahon Wobbegong

Old 07-07-13, 09:28 AM
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Upgrading city gears for touring on a Dahon Wobbegong

Hello, my wife and me are planning to ride the Way of St. James in a month or so. Although I am keeping the daily distances low so she doesnīt get too tired, part of the challenge is completing it with our 20 inch minivelos. The problem is that her bike only has 6 speeds (Shimano MF-TZ20 Tourney Freewheel 14-28T 6 Speed) with a 52t front chainring, and a tourney rd. What do you guys think is the best way to upgrade her gearing so she can climb those Galician mountains properly without completely switching the groupset? I am thinking of swapping the rear freewheel for a 7 speed shimano Megarange 14-34, 7s alivio derailleur and 7s altus shifter. That would keep the price around 50$-60$.
Please let me know what you think, thanks in advance.

Edit: Sheldon Brown's gear calculator is throwing 5.2-2.6 for the 14-28 setup and 5.2-2.1 for the 34t megarange one. Will that be enough?

Last edited by Vampy; 07-07-13 at 09:40 AM.
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Old 07-07-13, 06:06 PM
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Thats about all you can do short of fitting Sachs Dual Drive 7 by 3 rear hub
(ebay for those since not made anymore)

New ones are 8~9 speed cassettes .. But the trick is 3 internal gears are like a triple crank

without having to fit one..

Other option as you say Mega range .. maybe a double crank 52~36t
greasy finger shifting works if lashing up a FD is not simple.
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Old 07-07-13, 06:35 PM
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Suggest you consider dropping the front chainring size instead if you have any concerns. You already want to keep distances down - that'll reduce top speed which should be of least concern while increasing mechanical advantage everywhere.

Those are only 20" wheels and the bike isn't designed to handle heavy loads so travel light. How is she managing the bike as it is?
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Old 07-07-13, 08:16 PM
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Originally Posted by Burton
Suggest you consider dropping the front chainring size instead if you have any concerns. You already want to keep distances down - that'll reduce top speed which should be of least concern while increasing mechanical advantage everywhere.

Those are only 20" wheels and the bike isn't designed to handle heavy loads so travel light. How is she managing the bike as it is?
+1

If it were me I definitely be changing the cassette to something with a 32 or 34 tooth large cog AND changing the front chainring to something smaller. My first short tour after several years out of the saddle was on the do-it-all bike that I had half rebuilt before I stopped riding. At that time I was courier in a hilly city who also toured a few times and was super fit. I had that bike set up with a 53-42-32 and an 11-34 cassette. Needless to say, after several years of not riding those chainrings were far too large for loaded touring in mountainous terrain. Unfortunately I was lulled into thinking it'd be okay because I was able to commute okay on that set up for nearly six months before setting out on that tour. All the climbing (there was a LOT of it) was brutal, and I ended up walking for several miles.

I've never ran a single chainring in the front, so I'm not going to recommend a size for one, I honestly couldn't say what exact size would be best, but I'd suggest something 46T or smaller.

Seems like it should go without saying, but go ahead and replace the chain at the same time too.
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Old 07-07-13, 08:36 PM
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A 52T front sprocket on a 20 inch wheel with 1.5" tires is pretty equivalent to running a 36T front sproket on a 700 rim with a 25c tire. If you want to target a 22T equivalent than about a 32T chainring would do it. See if its feasible to run a 32/42 up front.
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Old 07-07-13, 08:49 PM
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Apart from the SRAM dual drives, another option is the Shimano Capreo cassette
Standard they are 9-26,ICE produces a custom 9-32 for their 20" trikes.

IMHO she will still do some walking in the mountains unless she is much fitter than I am (not too difficult).

Gears on my tadpole trike which weighs about 36 lbs have been modified to 48/36/22 and 9/34..

I doubt that you would need anything that extreme though.
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Old 07-08-13, 08:32 AM
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Great inputs everybody, thx for sharing your wisdom.

Originally Posted by Medic Zero
+1

If it were me I definitely be changing the cassette to something with a 32 or 34 tooth large cog AND changing the front chainring to something smaller. My first short tour after several years out of the saddle was on the do-it-all bike that I had half rebuilt before I stopped riding. At that time I was courier in a hilly city who also toured a few times and was super fit. I had that bike set up with a 53-42-32 and an 11-34 cassette. Needless to say, after several years of not riding those chainrings were far too large for loaded touring in mountainous terrain. Unfortunately I was lulled into thinking it'd be okay because I was able to commute okay on that set up for nearly six months before setting out on that tour. All the climbing (there was a LOT of it) was brutal, and I ended up walking for several miles.

I've never ran a single chainring in the front, so I'm not going to recommend a size for one, I honestly couldn't say what exact size would be best, but I'd suggest something 46T or smaller.

Seems like it should go without saying, but go ahead and replace the chain at the same time too.
I guess I will stick to the megarange AND smaller chainring. Although I love the idea of the SRAM Dual Drive I donīt want to spend a ton of money right now, since I am already buying trailer and all. I guess for now it will have to do. If she keeps putting miles on the bike, we will see...

To keep the weight low on her bike, part of the 'fun' is me carrying all our stuff while she carries herself, that will compensate for the difference in performance .
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Old 07-08-13, 01:18 PM
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Originally Posted by Burton
A 52T front sprocket on a 20 inch wheel with 1.5" tires is pretty equivalent to running a 36T front sproket on a 700 rim with a 25c tire. If you want to target a 22T equivalent than about a 32T chainring would do it. See if its feasible to run a 32/42 up front.
Thanks for pointing that out, I was speaking from a 26" wheel perspective, I wasn't aware of that difference.
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Old 07-08-13, 03:45 PM
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Consider putting a Patterson 2 speed internal crankset on her bike. It gives you the equalent of a 28/45 tooth front end. Have a look at my profile page to get an idea what it looks like with 20" wheels. I did the install myself and apart from getting a longer bolt and spacer to catch the chain stay it was very straight forward. There are excellent instructions on You Tube. It shifts flawlessly in all conditions even cranking under load.
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Old 07-10-13, 08:58 AM
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Originally Posted by Western Flyer
Consider putting a Patterson 2 speed internal crankset on her bike. It gives you the equalent of a 28/45 tooth front end. Have a look at my profile page to get an idea what it looks like with 20" wheels. I did the install myself and apart from getting a longer bolt and spacer to catch the chain stay it was very straight forward. There are excellent instructions on You Tube. It shifts flawlessly in all conditions even cranking under load.
Thx for the input, but I think itīs too much weight and she doesnīt need the internal gearing. Iīd go with an standard double front. Anyway, it looks awesome, never saw that before. A really clean config.
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Old 07-10-13, 10:40 AM
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internal gearing is a snap to shift, though .. but costly.. the above, Patterson ,
is more than you paid for the bike I expect.

I was willing to buy the Swiss Schlumpf

For their similar 2 speed crank they fit a 110 bolt circle so 34t acts like a 54t. same 1,6X..
I think they were first , many years ago..

the other one is a use of the same sort of mech, adding a Cable shifter
External bearing BB style .. SRAM / Truvative has 2 others in Mountain Bike niche..

my mountain drive reduction gear is 2,5.. 50 acts like a 20t in low range..

i run through my 3 speed twice..

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Old 07-10-13, 03:55 PM
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No more advice on gears... Have a good trip on the Camino. You will have a couple big hills. The first time I walked up to O'Cebreiro it was snowing, and on my second trip I got psyched out and ended up in a taxi.

There are lots of sections where you can ride right on the footpath for miles and miles, but I would move to the roadways for the biggest hills.
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Old 07-21-13, 10:11 AM
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Originally Posted by skilsaw
No more advice on gears... Have a good trip on the Camino. You will have a couple big hills. The first time I walked up to O'Cebreiro it was snowing, and on my second trip I got psyched out and ended up in a taxi.

There are lots of sections where you can ride right on the footpath for miles and miles, but I would move to the roadways for the biggest hills.
Thanks! I finally bought the MR 11-34 cog, Shimano Altus 7s shifter and Alivio long cage rd for the Wobbegong, on top of a trailer for my Smoothound to carry our stuff. Here you can see the setup (the child seat wonīt be there, I am using him as load )

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Old 08-26-13, 08:20 AM
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Hello. Finally we managed to complete our Camino with our little urban bikes. It was our first tour and it got us hooked. The pictures show the bikes along the Way, and the last one my homemade map holder (with a dvd case, I know itīs cheap, but it worked). The trails were rougher than I expected, but although we found some ATB riders telling us it was impossible with the Dahons, we did it!

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Old 08-26-13, 12:45 PM
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Very cool, Vampy! Glad you had a nice trip and I like your map holder
Does the Wobbegong have the same frame as your Smooth Hound?
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Old 08-29-13, 10:58 AM
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Thanks!

Originally Posted by rodar y rodar
Does the Wobbegong have the same frame as your Smooth Hound?
Pretty much the same frame shape, but the Smoothound frame breaks in two pieces and the Wobbegong is a regular minivelo
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