Folding Bikes - Dahon speed d7 gear conversion?
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12-07-08, 03:07 PM
I am planning to buy a Dahon Speed d7 soon. My only concern is the high gear ratio.
Do you think it is possible to change the stock chainring with a triple one from another non folding bike? (shimano sis, 28/38/48 teeth). Or will that change cause problems by folding the bike etc.?
For such a gear conversion on a folding bike, do I have to use the dual drive hub only? Or would any normal triple chainring work?
12-07-08, 03:15 PM
The trouble with doing something like that with the D7 is that the proprietary Neos derailleur is extremely short cage and won't handle that much chain, not by a long shot. If you like the Speed, you would need a higher up model like the P8. The D7 doesn't have a derailleur hanger, but the others do. Go figure, hey?
I was a bit annoyed about it too, wanted to put a double on mine. However, I would think that one could still run a dual drive on the D7 at least, using the Neos.
12-07-08, 04:38 PM
The thing is, I found a brand new second hand d7 for a reasonable price and besides, there's no other option then d7 and mu, when you want to buy a dahon in my country.
Did I get it right, do you mean a double chainring like the one from my road bike (shimano rx100, 42/52) would be better to use? That would give me a lowest gear value of 28 instead of the 33 in stock version.
I would get it lower even to 25 gear inches by changing the casette with a 34 tooth mega range.
Or is it so that I have to use only the dual drive hub for that aim? In that case I might have to order it from abroad and that would increase the expenses...
12-08-08, 02:14 AM
Btw, I made some reading about d7 and its gears in the forum and cleared my mind a bit more concerning the Neos derailleur. So at the moment I think I'll sacrifice some higher gears (why looking for speed at the first place when riding a low end folder?) and change the 52t chainring with a single 42 t one and the 11-30 casette with an 11-34 one. This will give me some 25 gear inches at lowest instead of 35; and the highest gear will go down from 95 to 77. I hope to compansate this difference with a high cadency and get a decent speed that way.
If this system won't work properly, I can still order a dual speed hub and use my 52 t stock chainring with it (at least thats what I hope). Are the dual drive hub and the standart Neos derailleur on d7 compatible?
12-08-08, 02:37 AM
The Dual Drive supposedly works with standard derailleur systems, and I don't see why it wouldn't, either. The Neos should work fine for that purpose. Logically, the cassette is still in the same place as a normal system, and so long as the Neos isn't in the way of the clickbox with its unusual placement it will still control the shifting properly as it would for a regular hub.
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