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Old 07-18-11, 07:34 PM   #1
sudoshift
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Top Speed: owenfinn's Capreo Curve SL vs sudoshift's Nexus 8 IGH Curve SL

owenfinn and I have Dahon Curve SL folding bikes. We've been trying to max out our speeds on flat roads just for the heck of it ever since the Top Speed on a Folder??? thread.



Dahon Curve SL by owenfinn16, on Flickr
owenfinn's 2009 Dahon Curve SL Shimano Capreo 9-Speed
Gear Inches: 31" - 90"

vs.


2008 Dahon Curve SL by sudoshift, on Flickr
sudoshift's 2008 Dahon Curve SL Nexus 8-Speed IGH
Gear inches: 38" - 85"

Let the speed challenge begin!
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Old 07-18-11, 10:19 PM   #2
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Ha! Bring it on!

The tale of the tape looks like the Capreo gives me just a bit more "reach".

Typhoon today, so I`m gonna rest up and have another go at that elusive 25mph barrier again tomorrow.
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Old 07-19-11, 11:26 PM   #3
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Typhoon eh? As you saw on my Flickr page, I tried doing a run today during lunch but it was just too windy. We'll give her a go maybe tomorrow.
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Old 07-20-11, 01:07 AM   #4
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Excuses, excuses.

Go for the gold, guys! Don't let folder fans down!
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Old 07-20-11, 09:47 AM   #5
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Show the Math.. what is the gear ratio x wheel size?
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Old 07-20-11, 12:03 PM   #6
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I thought that the Nexus 8 had a tad more than a 300% range. Maybe you meant 28" to 85".
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Old 07-20-11, 07:32 PM   #7
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Quote:
Originally Posted by fietsbob View Post
Show the Math.. what is the gear ratio x wheel size?
For 3 smallest sprockets on the Capreo Curve SL I got -

16 x 53/9 = 94

16 x 53/10 = 85

16 x 53/11 = 77

A bit of a discrepancy from Dahon`s numbers which lists the top at 91. I wonder why.

Anyway, so far, the top speed for me was 39.4 kph (24.48 mph) which I hit spinning like mad in 7th gear before slowing down because of traffic.

So, when the quest for speed continues, the question is whether 8th and 85 gear inches is too big of a jump for my legs. I know 9th will slow me down on the flat because I can`t maintain the RPM.

We are in day 3 of rainy, windy weather in Yokohama but tomorrow should a good day.

BTW I have 1185 punched into my computer for the wheel circumference for the Marathon Racers. Any reason to think this is incorrect? I don`t really have time to roll it out.

just noticed the link below on google (but it`s firewalled for me so I can`t open it).

Place your bets?!?!
http://www.cyclebetting.com/cycling/...-igh-curve-sl/
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Old 07-20-11, 10:42 PM   #8
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Quote:
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Excuses, excuses.

Go for the gold, guys! Don't let folder fans down!
"Excuses are like a** holes, everyone has one and they stink!" -- We will give it our best.

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Show the Math.. what is the gear ratio x wheel size?
I'll get back to you.

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I thought that the Nexus 8 had a tad more than a 300% range. Maybe you meant 28" to 85".
I sure hope so! It might be, I can climb some pretty steep hills with relative ease. The lightness of the bike surely helps.

Quote:
Originally Posted by owenfinn View Post
For 3 smallest sprockets on the Capreo Curve SL I got -

Anyway, so far, the top speed for me was 39.4 kph (24.48 mph) which I hit spinning like mad in 7th gear before slowing down because of traffic.

So, when the quest for speed continues, the question is whether 8th and 85 gear inches is too big of a jump for my legs. I know 9th will slow me down on the flat because I can`t maintain the RPM.

We are in day 3 of rainy, windy weather in Yokohama but tomorrow should a good day.

BTW I have 1185 punched into my computer for the wheel circumference for the Marathon Racers. Any reason to think this is incorrect? I don`t really have time to roll it out.

just noticed the link below on google (but it`s firewalled for me so I can`t open it).

Place your bets?!?!
http://www.cyclebetting.com/cycling/...-igh-curve-sl/
How did this get on cycling bets? LOL!

FYI: I also have my CATEYE computer set to 1185 and I believe we both have 16x1.5 Marathon Racers right?

I'll resume the 'challenge' after Comic Con is over on Monday!
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Old 07-21-11, 05:59 AM   #9
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I too use 1185mm tire circumference for my 16" x 1.50 Marathon Racers on my curve.

You should use the true tire diameter instead of 16" in the GI calculation.

Tire circumference = 1185mm
Tire diameter = 1185mm / pi = 377.2mm (14.85")

For 3 smallest sprockets on your Capreo Curve SL you have-

14.85 x 53/9 = 87.45

14.85 x 53/10 = 78.71

14.85 x 53/11 = 71.55
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Old 07-21-11, 07:46 AM   #10
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I too use 1185mm tire circumference for my 16" x 1.50 Marathon Racers on my curve.

You should use the true tire diameter instead of 16" in the GI calculation.

Tire circumference = 1185mm
Tire diameter = 1185mm / pi = 377.2mm (14.85")

For 3 smallest sprockets on your Capreo Curve SL you have-

14.85 x 53/9 = 87.45

14.85 x 53/10 = 78.71

14.85 x 53/11 = 71.55
Those numbers seem too low - plus if I actually physically measure the diameter with a tape measure I can see that it is definitely more like 15.5" or 39.5cm.

15.5 x 53/9 = 91.27 (which is the same # Dahon gives us)

so that seems about right. So if 15.5" (39.5cm) is the true diameter, let`s get the circumference.

395mm x pi = 1241mm

So it looks like that 1185 number for the Marathon Racer is way off.

Right?
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Old 07-21-11, 08:29 AM   #11
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Wow! You guys are FAST!

Sam
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Old 07-21-11, 08:56 AM   #12
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Quote:
Originally Posted by owenfinn View Post
Those numbers seem too low - plus if I actually physically measure the diameter with a tape measure I can see that it is definitely more like 15.5" or 39.5cm.

15.5 x 53/9 = 91.27 (which is the same # Dahon gives us)

so that seems about right. So if 15.5" (39.5cm) is the true diameter, let`s get the circumference.

395mm x pi = 1241mm

So it looks like that 1185 number for the Marathon Racer is way off.

Right?
Yes, you are absolutely right. The cateye manual seems pretty off the mark for the marathon racers.

I just measured a close 1226mm from a single revolution, give or take a few mm. This works out to a diameter of about 15.36".

15.36 x 53/9 = 90.45
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Old 07-21-11, 10:11 AM   #13
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The only way to do this properly is to do two runs in opposite directions on the same road and then average the results. This will account for wind / gradient. (Kind of.)
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Old 07-21-11, 10:57 AM   #14
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The only way to do this really properly is to get corporate sponsorship for the race FIRST.
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Old 07-23-11, 12:14 AM   #15
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The only way to do this really properly is to get corporate sponsorship for the race FIRST.
Operators are standing by!

Took advantage of the mild temperatures to have another go at glory, this time along the Tsurumi River near Nissan Stadium (I'll post a few photos later).

I was still in my work clothes and my backpack was still attached, like a sail, high on the seatpost. In addition, it was a bit breezy so tried to find a stretch that was screened by the high river grass.

With the computer still set at 1185 I blasted through 40.2 kph to 45.4 kph (28.2mph)!

The euphoria was short-lived however. Taking bendombroski advice I turned the bike around and set off in the opposite direction. This time I struggled to hit 34kph. It wasn't a strong wind but the backpack acting like a parachute was a killer.

Hope to have another go after work somewhere else.
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Old 07-24-11, 05:38 PM   #16
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(I'll post a few photos later).








45.4 kph - but with the wind at my back. Could only do 34 the other way.

Last edited by owenfinn; 07-24-11 at 05:43 PM.
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Old 07-24-11, 05:50 PM   #17
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Woohoo!
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Old 07-25-11, 08:10 PM   #18
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Whoa what the hell man! 28.2 MPH!!! Very nicely done! Although using the backpack as a "sail" is questionable. I do envy your gorgeously smooth roads.

I tried a run today after work and I picked a spot that had a nice tail wind, my only problem was the the road was waay too bumpy and poor.


Proving Grounds Bumpy Roads by sudoshift, on Flickr

Every time I kept going up in speed I'd have to watch out for a crack or bump on the road. I'll have to try to find a new place. The roads here are horrible. Either cracks or too much loose gravel.

Once again topped out at 23.3 MPH


Nice View by sudoshift, on Flickr

I took it easy on this spot since there was loose gravel and I really didn't feel like falling face first into the rocks below.

Guess its safe to say that . . .

Round 1 Winner: owenfinn's 2009 Capreo Curve SL
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Old 07-26-11, 07:25 AM   #19
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Actually I didn`t feel that first wind-aided run along the river prooved very much.

Today was a beautiful day and I didn`t have to work, so I finally was able to ditch the office clothes and the big backpack to spend an enjoyable afternoon pedaling like a madman through the streets of Yokohama.

Managed to break through the 40.2kph/25mph barrier 6 times and hit a top speed of 43.6kph twice on 2 different roads.

The first attempt was on this road. Hit 43.6kph in one direction and then went the other way and got up to 40.9.

http://www.mapmyride.com/routes/view/43194366/







I think it is now safe to say - without doubt, the Capreo Dahon Curve SL is the fastest 16" folder on the planet.
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Old 07-26-11, 04:52 PM   #20
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Okay, sudoshift. You need to cut weight. Ditch stuff like fenders, silly bottle holders, and packs. Just wear a helmet and speedo!
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Old 07-26-11, 07:16 PM   #21
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I think it is now safe to say - without doubt, the Capreo Dahon Curve SL is the fastest 16" folder on the planet.
sudoshift, did you hear that? Are you going to let owenfinn get away with that claim?

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Okay, sudoshift. You need to cut weight. Ditch stuff like fenders, silly bottle holders, and packs. Just wear a helmet and speedo!
LOL.
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Old 07-27-11, 06:13 PM   #22
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07/27/2011 by sudoshift, on Flickr

Okay let's not celebrate just yet. I only had time for a couple of runs. I need to find a different road. I am tired. . .
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Old 07-27-11, 07:02 PM   #23
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Originally Posted by sudoshift View Post

07/27/2011 by sudoshift, on Flickr

Okay let's not celebrate just yet. I only had time for a couple of runs. I need to find a different road. I am tired. . .
26.1 mph = 42 KPH - Nice one congrats!

OK - I will put down my bike.
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Old 07-28-11, 12:43 AM   #24
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Hey sudoshift, you do the two-run thing (one way in each direction)?
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Old 07-28-11, 11:14 AM   #25
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You might still want to keep the bike up there finnster, I don't think mine (either because of the bike's or my ability) can go higher than 26.1 MPH. I only managed to hit that once and for about two seconds. Which is why i still need to find a couple different roads.

It was neat that I was keeping up with this road race biker guy that kept turning to look back going "WTF." Then he speed off as I let up.

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Hey sudoshift, you do the two-run thing (one way in each direction)?
Oh I forgot to mention that, the way back I could get up to 23.8 MPH.

I came down with a bug so I'll have to resume the "trials" next week. Although i think the finn's Capreo will be hard to beat.
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