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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 06-10-08, 01:07 PM   #1
Puffer
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What a ride.

Thanks to information on this site I bought a Dahon impulse 24 speed
Well, yesterday done my first ride on it. I went by train to Swansea, and then off to go, first along the cycle track beside the beach, that went on for 4 miles. And found out that bikini swimwear is lethal, cycling along watching a few girls in said costume, and I went into a sand dune.

Turned off the beach track eventually, taking us up through the woods on a tarred track, then more coast. Eventually reaching Camarthen, plenty of places of interest on the way. Dylan Thomas boat house. Pendine sands, the place where Bluebird the racing car broke the land speed record, in short plenty of photo opportunities.

Found two faults with the bike, one there is a pump built into the seat post, and you had to watch that the handle did not drop onto the road, what have you done to overcome this?
And I will have to change the 52 tooth chain wheel, I have a 46 tooth however there will be no guard on the outside, will that be a problem when I need to fold it?

All in all a real memorable day.
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Old 06-10-08, 01:53 PM   #2
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Originally Posted by Puffer View Post
Thanks to information on this site I bought a Dahon impulse 24 speed
Well, yesterday done my first ride on it. I went by train to Swansea, and then off to go, first along the cycle track beside the beach, that went on for 4 miles. And found out that bikini swimwear is lethal, cycling along watching a few girls in said costume, and I went into a sand dune.

Turned off the beach track eventually, taking us up through the woods on a tarred track, then more coast. Eventually reaching Camarthen, plenty of places of interest on the way. Dylan Thomas boat house. Pendine sands, the place where Bluebird the racing car broke the land speed record, in short plenty of photo opportunities.

Found two faults with the bike, one there is a pump built into the seat post, and you had to watch that the handle did not drop onto the road, what have you done to overcome this?
And I will have to change the 52 tooth chain wheel, I have a 46 tooth however there will be no guard on the outside, will that be a problem when I need to fold it?

All in all a real memorable day.
Puffer, removing the guard will cause no problem whatsover folding (that'll be less width there, not more!)- likely to do that myself. There's a lot of info on the seat post pump on the Dahon.com forums, getting an account over there's a good idea.
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Old 06-10-08, 03:14 PM   #3
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You may want to check on the chainring to see if it is replacable. I just learned that my Dahon Curve's chainring can't be swapped without swapping the whole crankset as well. Your model may be different, though.

Curve D3 front chainring

I'm glad you enjoy your Dahon! Sounds like a great day trip for your first ride.
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Old 06-10-08, 03:18 PM   #4
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Glad you had a good ride into the dunes...

A simple solution for the moronic seat post pump design (I mean, seriously, c'mon Dahon) is to open the foot stand (the part that hinges out), then wrap a fat rubber band around the end of the pump near the valve a couple times. When you fold the hinged part back in, the rubber band gets in the way and keeps it from folding completely. Then when you slide the pump back into the seat post, it will be a tight fit and wont fall out easily. Might take a few tries to get it just right.
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Old 06-10-08, 03:44 PM   #5
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I must have the only upgraded pump in existance. Mine has a cap that simply screws on to the bottom of the seatpost, no issues with it popping out.

I'm pretty sure the Mu 24 is front crank is similar to the Mu P8. The chainring is removable and I believe it is 110 bcd (double check) some of the older ones (my speed pro) were 130mm standard road. Unfortunately the chainguard is bolted onto the chainring so you will lose that, but like others have said it's fine without it, just exposes the chain a little more.

So where are the pictures?!
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Old 06-10-08, 04:55 PM   #6
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Don't be too hasty removing the chain guard. Its main function is not to keep pants clean, but the chain on. When you shift gears, the chain experiences a sideways movement at the back and this produces a sideways ripple in the chain that moves forwards to the chainwheel. The ripple is worse shifting up because the up movement to a smaller sprocket is sudden, while the movement to a bigger sprocket is guided by shifter movement. If you get things wrong, the chain falls off, especially when the chain has worn in a bit. Happened to me many times, so I made a little chain guide for the front that arrests the ripple. Gaerlan also sells guide wheels for the same reason.
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Old 06-11-08, 11:21 AM   #7
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Thanks all.
The chain wheel can be easily replaced on this model, I already have a selection of chain wheels suitable.
I will try it, however jur as a point so I had a good look at the Sram derailleur, it as a long arm to take up the slack and quite a strong spring so it should be alright. I have a strict procedure regarding my chain.
What I have done for the last 50 years, is buy 4 chains and keep changing them regular, until the point comes when they are all worn. Then change the lot.

I will report on how it goes.
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