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Search: Posts Made By: pengyou
Showing results 1 to 50 of 316
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Forum: Folding Bikes
07-23-13, 08:11 AM
Replies: 3
Views: 1,230
Posted By pengyou

Smaller rear derailleur?

It is time to retire my 7 speed Dahon. Sad, but it has served me well. One of the things I did not like about it is that the rear derailleur hung pretty close to the ground. I have seen other...
Forum: Folding Bikes
08-22-12, 05:23 PM
Replies: 9
Views: 6,923
Posted By pengyou

Thanks! I am looking for a new bike and find a...

Thanks! I am looking for a new bike and find a lot more options now than I did five years ago when I bought my Dahon. Now I know what to look for.
Forum: Folding Bikes
08-08-12, 08:32 AM
Replies: 9
Views: 6,923
Posted By pengyou

Geometry and folding bikes

What about the geometry of a folding bike:

- makes the steering less "twitchy"?
- makes it more comfortable for touring/long rides with some equipment?
- makes it easier to maneuver in city...
Forum: Folding Bikes
05-25-12, 06:25 PM
Replies: 8
Views: 944
Posted By pengyou

Getting my bike repaired without getting ripped

I am going to take my dahon to a shop to get the chainring and possibly crank arms replaced. I live in Taiwan and there is a sham that a lot of repair people use here - they will say "we don't know...
Forum: Folding Bikes
05-25-12, 05:56 PM
Replies: 9
Views: 7,606
Posted By pengyou

So you are saying that it might be...

So you are saying that it might be better/cheaper/necessary to replace the whole assembly? Chain ring and cranks?
Forum: Folding Bikes
05-25-12, 08:03 AM
Replies: 9
Views: 7,606
Posted By pengyou

Dahon Speed needs a new chainring

I just shipped my Dahon Speed (7speed) from Shanghai to Taiwan and the chainring was bent in the process. Is this part something that I can get in any fairly good bicycle shop or is it a part that I...
Forum: Folding Bikes
11-01-11, 07:46 AM
Replies: 2
Views: 1,941
Posted By pengyou

Putting a bigger chainring on my dahon speed?

Now that I know that I can load my Dahon up, there are a couple of mods that I would like to make. One is to put a 3 speed hub gear on it - I have seen some for about $100. The other thing I would...
Forum: Folding Bikes
11-01-11, 07:16 AM
Replies: 9
Views: 1,106
Posted By pengyou

Sorry, it is the Dahon Speed D7. I just found...

Sorry, it is the Dahon Speed D7. I just found out it is rated for 230 pound rider, not total weight :) Time to get going...now if I could just find a way to put disc brakes on the front of it....it...
Forum: Folding Bikes
10-30-11, 05:43 PM
Replies: 9
Views: 1,106
Posted By pengyou

Thanks! I am in Shanghai now. I have a Dahon...

Thanks! I am in Shanghai now. I have a Dahon Boardwalk now that I have had for about 4 years but the specs that I got with the manual say 180 pounds. I only weigh about 180 pounds now but I am...
Forum: Folding Bikes
10-30-11, 06:25 AM
Replies: 9
Views: 1,106
Posted By pengyou

20" folder that will lug 220 pounds!

I have found some tables showing the rated capacities of folding bikes and they usually rate the bikes as capable of hauling 160 to 180 pounds. The tables seemed to be a few years old. Are there...
Forum: Touring
08-15-11, 07:37 AM
Replies: 4
Views: 651
Posted By pengyou

Trailer on a folding bike

I know that I am talking about a folding bike, and an electric one at that, but the salient part of this question is about towing a small trailer with a folding bike, so I thought I would put it in...
Forum: Electric Bikes
08-13-11, 09:22 PM
Replies: 5
Views: 821
Posted By pengyou

Thanks! Now for the tricky part...i have a 7...

Thanks! Now for the tricky part...i have a 7 speed cassette on the right side. I have read a post here and there that has mentioned that I might have to change the hub to use a left hand free...
Forum: Electric Bikes
08-13-11, 05:32 PM
Replies: 5
Views: 821
Posted By pengyou

ISO Left hand freewheel for Dahon speed

I am installing a 500 watt brushless motor on my Dahon speed. It is a chain drive and not a hub motor. The motor is small and light and will fit in the space behind the seat post without...
Forum: Electronics, Lighting, & Gadgets
06-05-11, 10:18 PM
Replies: 2
Views: 491
Posted By pengyou

Cycle computers controlling an electronic relay?

I have read several pages of info on the cycle computers. A few of them have alluded to the being able to control some "function" but did not give any examples or further explanation. Would it be...
Forum: Framebuilders
05-22-11, 03:09 AM
Replies: 0
Views: 675
Posted By pengyou

A variation on a pedal

http://www.halebikes.com/

Does anyone see any advantages of using the kind of pedaling system that is used in this bike? I know it probably adds a couple of pounds to the bike, but as I looked at...
Forum: Bicycle Mechanics
05-12-11, 06:53 PM
Replies: 11
Views: 915
Posted By pengyou

Wow! Thanks for the input. I am looking at the...

Wow! Thanks for the input. I am looking at the crank on my ebike. It is in the way of a place that would be an ideal candidate for a battery - low cog, protected from the elements, and not useful...
Forum: Framebuilders
05-12-11, 05:38 PM
Replies: 3
Views: 569
Posted By pengyou

Thanks! I hadn't thought of the handlebars. I...

Thanks! I hadn't thought of the handlebars. I did a quick estimate/measure...I think I may be able to get by without lowering the seat an appreciable amount. It is already about 3-4" too low for...
Forum: Bicycle Mechanics
05-09-11, 09:40 AM
Replies: 11
Views: 915
Posted By pengyou

Bicycle without a solid crank?

Has anyone ever seen a bicycle with a crank that did not go completely from right to left - instead each pedal was connected by a gear to a crank behind the seatpost?
Forum: Framebuilders
05-09-11, 07:04 AM
Replies: 3
Views: 569
Posted By pengyou

A recumbent electric bike?

This question is about an electric bike, but it is much more so about frames than it is about the electrical components. I want to buy a bike like this:

201191

If I were to move the crank...
Forum: Electric Bikes
05-07-11, 08:02 PM
Replies: 2
Views: 1,024
Posted By pengyou

Do you have pictures of your twin chain driven...

Do you have pictures of your twin chain driven setup? I was thinking that using another form of technology for the second motor would improve my chances of having one good motor at any time. Also,...
Forum: Electric Bikes
05-07-11, 12:21 AM
Replies: 2
Views: 1,024
Posted By pengyou

Suspension fork on an ebike

I have an ebike with 22" rims. It is about 3 years old and the front suspension is starting to feel like it needs some help. Before I take it apart, can someone tell me what makes it go boing...
Forum: Electric Bikes
05-06-11, 10:50 PM
Replies: 1
Views: 804
Posted By pengyou

Crank width on an electric bike?

I am shopping for an electric bike that is more electric than bike. It is a bit heavy duty and is designed to carry things but it still has pedals. The pedals have a really low gear ratio and are...
Forum: Electric Bikes
05-06-11, 08:41 PM
Replies: 12
Views: 5,117
Posted By pengyou

anybody know which factory makes this motor?

anybody know which factory makes this motor?
Forum: Electric Bikes
03-12-11, 07:38 AM
Replies: 7
Views: 3,044
Posted By pengyou

Yes, I was thinking of using the same battery -...

Yes, I was thinking of using the same battery - keeping it all at 48 volts. I plan on buying an a123 battery, possibly as big as 30 amp. I want distance because I live quite a distance from...
Forum: Electric Bikes
03-11-11, 05:24 PM
Replies: 7
Views: 3,044
Posted By pengyou

I want a lightweight hub motor to put on the...

I want a lightweight hub motor to put on the front of a e-scooter as a back-up. I plan on experimenting with an r/c motor in the rear. If something goes wrong with it while I am learning, I don't...
Forum: Electric Bikes
03-08-11, 09:22 PM
Replies: 7
Views: 3,044
Posted By pengyou

Lightest weight 48v 500 watt (or more) hub motor?

What is the lightest weight 48v 500 watt (or more) hub motor? Geared or not geared is ok.
Forum: Electric Bikes
11-11-10, 08:50 PM
Replies: 15
Views: 1,413
Posted By pengyou

not to mention the weight. Most of the "solar"...

not to mention the weight. Most of the "solar" bikes I have seen are all made of lightweight materials as well, increasing both the cost and the complexity of repairing them.
Forum: Electric Bikes
09-10-10, 08:18 AM
Replies: 3
Views: 792
Posted By pengyou

Thanks! I have never pulled apart a cassette...

Thanks! I have never pulled apart a cassette before...if there is some extra room in the axle, is it possible to put a spacer between 2 and 3 so that all gears can still be used?
Forum: Electric Bikes
09-10-10, 03:08 AM
Replies: 3
Views: 792
Posted By pengyou

Connecting a motor to 1st gear and using gears 2 to 7 to pedal?

I have a 7 speed bike with a 1st gear that is so low it is practically useless. I am going to put a motor on the bike (non hub motor) with a chain to drive the rear wheel. Is it possible to modify...
Forum: Folding Bikes
09-09-10, 02:53 AM
Replies: 2
Views: 794
Posted By pengyou

Upgrading gears on a Dahon 7spd?

I have a Dahon 16" 7 speed bike that I love to ride. My only complaint with it is that 1st gear is worthless for me. Is it possible/easy to have 1st gear removed and then have another smaller gear...
Forum: Folding Bikes
09-08-10, 08:26 AM
Replies: 6
Views: 1,317
Posted By pengyou

Can I put this drum brake on the front axle of my Dahon D7?

I am going to put a motor on it and would like to upgrade the braking capabilities. I have found this drum brake:

http://sheldonbrown.com/harris/sturmey-archer-hubs.html

It is the X-FD Front...
Forum: Folding Bikes
08-13-10, 01:46 PM
Replies: 23
Views: 1,544
Posted By pengyou

Is 50 kph on a folder a white knuckle experience?

I am thinking of putting a motor on my Dahon with 16" wheels that would let it go 50 kph (30mph) A couple of cycling friends have suggested that this might not be a safe speed for a folder with no...
Forum: Electric Bikes
08-04-10, 05:08 PM
Replies: 15
Views: 1,413
Posted By pengyou

It seems to me that a recumbent would be the best...

It seems to me that a recumbent would be the best bike to go solar because 'bents have less wind resistance because they are closer to the ground.
Forum: Folding Bikes
08-04-10, 07:01 AM
Replies: 13
Views: 1,022
Posted By pengyou

I can just see mypicture in the front page of the...

I can just see mypicture in the front page of the shanghai newspaper now...foreigner crazed by the heat tries to take his life by wearing mosquito netting and driving down the street...film at 11
Forum: Folding Bikes
08-04-10, 03:54 AM
Replies: 13
Views: 1,022
Posted By pengyou

Has anyone seen a windshield for a 16" folding bike?

I ride with a friend around my school and there are so many insects that at times we dare not talk for fear of ingesting an unknown form of protein, along with whatever pesticides it may be carrying....
Forum: Bicycle Mechanics
08-03-10, 06:50 AM
Replies: 6
Views: 7,724
Posted By pengyou

Clamp on disk brakes?

My bike came with V brakes and no provision to mount disk brakes. Are there any aftermarket disk brakes that can be clamped onto the fork, vs. needing a hole drilled into the frame?
Forum: Folding Bikes
08-03-10, 12:59 AM
Replies: 11
Views: 2,020
Posted By pengyou

Amen!

Amen!
Forum: Folding Bikes
08-02-10, 09:11 AM
Replies: 11
Views: 2,020
Posted By pengyou

Can I do these upgrades to my Dahon D7?

I would like to do the following upgrades:

replace the fork with a suspension fork
change the brakes to disk
add a freewheel to the right hand side

I want to do these upgrades mostly because...
Forum: Electric Bikes
07-31-10, 08:07 AM
Replies: 47
Views: 6,813
Posted By pengyou

My personal experience...as well as observing...

My personal experience...as well as observing friends...people who buy motor/battery kits to do "pedal assist" usually end up sitting and not pedaling, and just enjoying the ride :)
Forum: Electric Bikes
07-31-10, 05:40 AM
Replies: 2
Views: 914
Posted By pengyou

IGH for ebikes?

I am installing an electric motor on a bike that will use a chain to power the rear wheel. is it possible/wise to install a 3 speed internal gear hub to help get better use of the power? If so, can...
Forum: Electric Bikes
10-02-08, 07:20 PM
Replies: 2
Views: 860
Posted By pengyou

hub motor

What do you think of this brand of hub motor on a dahon folder?

http://stores.ebay.com/City-e-Cycle-Golden-Front

I am leaning towards the 1000 watt motor because Portland is pretty hilly. I...
Forum: Electric Bikes
09-09-08, 12:48 AM
Replies: 1
Views: 820
Posted By pengyou

motor on the front fork of a Dahon?

has anyone found a motor that will fit on the front fork of a Dahon?
Forum: Electric Bikes
08-30-08, 01:31 PM
Replies: 35
Views: 3,909
Posted By pengyou

Chain driven electric bikes claims

If you look on the following website:

http://www.cyclone-usa.com/store.php?crn=199

It says " Because it uses the bike's rear gears, this 360w motor will outperform hub motors of equal or larger...
Forum: Folding Bikes
08-13-08, 07:35 PM
Replies: 0
Views: 514
Posted By pengyou

Can I put this motor on my folder?

http://www.cyclone-tw.com/order.htm

I have a Dahon speed. There is more than enough room in front of the rear wheel. Has anyone ever done this?
Forum: Bicycle Mechanics
07-15-08, 08:41 AM
Replies: 1
Views: 355
Posted By pengyou

Making the crank wider

Sorry for such a lame title. I am not sure how to succinctly describe what I want to do. I want to put a motor on my folding bike with a chain that drives the rear wheel. I want to put the motor...
Forum: Folding Bikes
07-15-08, 08:34 AM
Replies: 5
Views: 2,216
Posted By pengyou

Wow! Third frame...how often do you ride it?

Wow! Third frame...how often do you ride it?
Forum: Bicycle Mechanics
07-15-08, 08:30 AM
Replies: 19
Views: 877
Posted By pengyou

Illuminating my gear indicator

I have a Dahon Speed with a 7 speed cassette and really slick indexed shifting system. I love to ride at night and would like to find some way to illuminate the gear indicator. Any suggestions?
Forum: Bicycle Mechanics
07-14-08, 12:31 PM
Replies: 3
Views: 378
Posted By pengyou

hub gear question

Do they make left handed hub gears, i.e. with the freewheel on the left hand side? If not can a hub gear just be swapped and have the freewheel replaced with a leftie?
Forum: Folding Bikes
07-14-08, 12:22 PM
Replies: 5
Views: 2,216
Posted By pengyou

How can I increase the weight capacity of my Dahon?

The brochure says it can handle 230 pounds and at 190 I am pretty close, especially when you throw in a gallon of water (yes, that is what I need for a full days activity out in the middle of...
Forum: Folding Bikes
07-14-08, 06:42 AM
Replies: 62
Views: 8,408
Posted By pengyou

Thanks! It seems I hit a nerve here :) I will...

Thanks! It seems I hit a nerve here :) I will play around with my seat position and handle bar height. I have noticed that I spend a lot of time looking at the ground when I go downhill...that...
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