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20 inch vs 26 inch and speed performance..

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20 inch vs 26 inch and speed performance..

Old 11-08-14, 04:15 PM
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Cursed Chico
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20 inch vs 26 inch and speed performance..

Hello. I live in Istanbul Turkey.

I need to buy a folding bike. I will go around 30 kms everyday to school. While going, the way doesnot have so much hills to climb. But while coming, it will be hard so i can sometimes use transportation. So, i prefer folding.

But i am confused about 26 or 20 inch because my way is long and i need to go fast. If i can go around 20 km/h, i can arrive in 1.5 hour time. But in the mornings, there is traffic so it will make me go some slowly.

I am not sure about 26 or 20 can go faster because each rider user says different thing. I need performance and i want to climb hills without stopping.

Here we dont have so much choices. Probably Dahon VYBE C7A i will buy. Or if 26, tern joe or i f i can find cheap, giant express maybe.

My condition is good. My height is 177 cm, weight is 72 kg.So, what can you say about my possible bike trip?
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Old 11-08-14, 06:38 PM
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20" stows in a smaller space.. the biggest impediment to speed is the power output of the engine,
and the frontal area size of the meat bag on the saddle trying to push the air out of the way..

when tired the smaller bike would be easier to get a ride, from someone.

Adding .. all 4 of those are sent out with a straight bar .. as some of the Prior posts offer .


you take over from there . swap In Bull Horns or drop bars, or what have you, to get that

Low over the bars "Agressive" ride Posture.

Last edited by fietsbob; 11-09-14 at 04:44 PM.
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Old 11-08-14, 06:47 PM
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World's fastest bike has 20" wheels. Wheel size won't slow you down.
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Old 11-08-14, 06:51 PM
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Gearing and tires will make a bigger difference. You can compensate for smaller wheels with taller gearing.
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Old 11-09-14, 04:00 AM
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mulleady
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I'd recommend the Tern as it has a better frame hinge than the Dahon. One like this:

Tern Folding Bicycle D8 Link | eBay

20" can be every bit as fast as 26" and more agile steering. It's only on competitive and performance cycling on or off-road that 26" wheels will show a significant difference.
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Old 11-09-14, 09:50 AM
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I cant buy from internet because if it is more than 75 euros, the government taxes it so it becomes really expensive.

tern d8 is expensive for me also.

SO after these comments, it is certain that i will buy 20 " wheel one.

But riders say for example when going down, it is speeding and for example after 30 km/h, they start to lose control of bicycle. What do you think of that?


My options are:



bfold3,

https://www.google.com.tr/url?sa=t&r...Uu385PfNh_iO8g

dahon vybe

Dahon Vybe C7A Folding Bike Review - Will low price compromise Comfort and Quality?


Tern Link D8

https://www.google.com.tr/url?sa=t&r...diHTetNl3MiTGw

dahon eco c6
https://www.google.com.tr/url?sa=t&r...Md7obZVaS8G9qg

dahon eco c7

https://www.google.com.tr/url?sa=t&r...ObtPGdj43ABVbw
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Old 11-09-14, 01:39 PM
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Loss of control above 30km/h? That is rubbish. I have had a wide variety of folders, and once you are used to the quick steering of folders, you will enjoy it more than a big wheeler. I hade a 16" wheeled folder at more than 70km/h and it was rock steady. I routinely ride much more than 30km/h every day. I only have small-wheelers.
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Old 11-09-14, 01:45 PM
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Originally Posted by jur View Post
Loss of control above 30km/h? That is rubbish. I have had a wide variety of folders, and once you are used to the quick steering of folders, you will enjoy it more than a big wheeler. I hade a 16" wheeled folder at more than 70km/h and it was rock steady. I routinely ride much more than 30km/h every day. I only have small-wheelers.
But maybe it is about the brand of bike? And with normal bike, it is normal to go with 50 60 km/h but with 20" wheeled bike, i dont know if it is easy.
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Old 11-09-14, 02:10 PM
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There is the 451mm skinny high pressure tire /wheel in a 20" category .. . VS 406 more tire width so take rougher streets
& lots more different tires..


and you can go quite quickly following behind someone riding motorscooter right in front of you .. Aka Motor pacing..



SO, how long can you sustain over 50 KM, an Hour, on your Own effort?

52 km an hour, for 60 minutes, and there may be a Pro career in your future ..
given that is the approximately the current world record .

Last edited by fietsbob; 11-09-14 at 04:46 PM.
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Old 11-09-14, 02:12 PM
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Originally Posted by Cursed Chico View Post
But maybe it is about the brand of bike? And with normal bike, it is normal to go with 50 60 km/h but with 20" wheeled bike, i dont know if it is easy.
It is not 'normal to go 50 to 60km/h with any bike unless you're very fit or going downhill. If you can average 30km/h on roads for over an hour, you are worthy of gong into competitive amateur cycling races, possibly even pro!

Whether it's 20" or 26" I can assure you the peak and average speed attainment will be down to the rider. A good quality bike makes a difference regardless of wheel size which is why I recommended the Tern for you above.
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Old 11-09-14, 02:15 PM
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Originally Posted by jur View Post
Loss of control above 30km/h? That is rubbish. I have had a wide variety of folders, and once you are used to the quick steering of folders, you will enjoy it more than a big wheeler. I hade a 16" wheeled folder at more than 70km/h and it was rock steady. I routinely ride much more than 30km/h every day. I only have small-wheelers.
Let's qualify that by saying you are one exceptionally fit lad Jur lol! It's pretty safe to say you would leave some lycra wannabees in your wake on your smaller bikes ;-)
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Old 11-09-14, 02:25 PM
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Originally Posted by fietsbob View Post
There is the 451mm skinny high pressure tire /wheel in a 20" category .. .


and you can go quite quickly following behind someone riding motorscooter right in front of you .. Aka Motor pacing..



SO, how long can you sustain over 50 KM, an Hour, on your Own effort?

52 km an hour, for 60 minutes, and there may be a Pro career in your future ..
given that is the approximately the current world record .


I will only go around 30 km. And of course i cant use at so high speeds. There will be traffic. I meant when i go down on hills, i want to use at so high speeds, not to slow down.

And the script is broken i think, i can only see a new post after my post despite i saw 2 in my mail.

I cant afford that tern. Tern d8 maybe i can buy. or giant express. but probably Dahon VYBE C7A.
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Old 11-09-14, 03:12 PM
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I agree with everything that is said here. The advantage of small stowage outweighs the disadvantages associated with small wheels. I used to believe that small wheels were superior because they are stronger and have a lower frontal profile. However, they do produce a very slightly less secure feeling, particularly because they transmit shocks more readily than larger wheels. They also do have a slightly higher rolling resistance in the real world. Physicists do not fully understand why this is, but it seems to be true in extensive real world testing by tire companies and by people with power meters. This can be minimized with Ultremo tires, but then you are back to having more transmission of road shock unless your bike is suspended. On my racing recumbent, I average about 23MPH if there is no wind to fight. On my Brompton, I average about 15MPH. Lots of variables there, like muscle groups, tires, wheel size, etc., but at the end of the day the most important thing is to keep the wind from slowing you down. So, give yourself some way to drop your torso as low as possible.
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Old 11-09-14, 07:17 PM
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Holding 30-40kmh on the flat for more than a few hours requires some exceptional fitness. I can hold around 44 on the flat for about 15 minutes but its very hard. Going downhill on 29 inch wheels and big chain rings I've managed to hit 70 once. I think I could go faster, but I don't want to. As for control? Get the geometry right and the bike is rock solid. I'd worry more about brakes at that speed.
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Old 11-09-14, 08:07 PM
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wheels act like a gyro when you are moving, seen motorcycle videos of someone on a motorcycle showing what happens when you bash your bars.

Obviously there is a weight difference, but the principle is the same. 20" wheels will only be noticeably different at slower speeds.
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