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Old 01-02-09, 02:17 AM   #1
shun917
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How fast would a 20" mini velo go? (Bianchi Mini Velo 7)

Hi,

I'm interested in buying a new bike and wanted to try something new. I was thinking a 20" tire bike but not a foldable because its not something I really need. I was looking online and was thinking the Bianchi Mini Velo 7 because I personally like Bianchi and the price is reasonable (bout 40 000 yen).

I'm just concerned about the speed because of the 20 inch tires. What sort of speed am I expected to get compared to say a Bianchi Road Bike.

Would appreciate any help!

Thanks,
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Old 01-02-09, 04:00 AM   #2
joseff
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If you're looking for roadbike gearing you'd want either:
- a 60t chainring, eg 60/11 on 20x1.5" = 103" gear
- a DualDrive/Intego setup eg DualDrive with 44t chainring 1.37*44/11 on 20x1.5" =104" gear

I haven't seen the Bianchi MV 7, but the model 9 doesn't look like it has the legs to go fast. Beautiful though... love the livery.
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Old 01-02-09, 05:24 AM   #3
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Thank you for the response. If the Bianchi is a slow bike, is there any bike in the same category in a similar price range you recommend or is it possible to modify the bike the way you mentioned in an economic way. The other bike I had my eyes on was the GIOS Mignon which is a bit more expensive (probably as much as I'm willing to pay), is that a better choice for speed? As well, I'd like to know what the difference is in terms of speed comparing a 20" small wheel to the traditional sizes. Since I've never tried a small wheel bike excluding a BMX a couple of times, I have no idea what to expect other than the vague idea that bigger wheeled bikes are faster than smaller wheeled bikes.
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Old 01-02-09, 05:59 AM   #4
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I have a Dahon SmoothHound mini-velo with 20" wheels. I also ride a 700C Fuji Team Issue. My mini-velo is my training bike, and my Fuji is used for faster rides. The Fuji is about 10% faster, but I think that's due to it being 4 or 5 lbs lighter.

Both bikes perform very well. There is not that much difference between 20" wheels and 700C. While people will argue endlessly about the very small differences between wheel sizes - in wind resistance, rolling resistance and spinning weight, the net difference between the two are virtually unnoticeable to the recreational rider.

There are many other characteristics of bikes that make more difference, IMHO. Bike weight, stiffness, quality of hubs, to name a few.

So choose the bike you want. Don't let wheel size stop you.

The SmoothHound, modified with drop bars and Capreo gearing:

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Old 01-02-09, 12:18 PM   #5
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Basically it's all about the engine and comparing like with like.

A quality 20" wheel with premium tyres isn't going to be significantly slower than a 700 wheel with similar grade tyres when all else is equal.
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Old 01-02-09, 04:43 PM   #6
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Basically it's all about the engine and comparing like with like.

A quality 20" wheel with premium tyres isn't going to be significantly slower than a 700 wheel with similar grade tyres when all else is equal.

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Old 01-02-09, 06:00 PM   #7
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Thanks for the responses, I think I got my answer!
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Old 01-02-09, 07:44 PM   #8
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My folder is a very early production Bike Friday Pocket Rocket. I have no problem riding with big wheel bikes but my top gear is a 60 to 11 or 110 gear inches. Roger
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Old 01-02-09, 08:20 PM   #9
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My folder is a very early production Bike Friday Pocket Rocket. I have no problem riding with big wheel bikes but my top gear is a 60 to 11 or 110 gear inches. Roger

Do you have a link, to calculate the gear-inch-es for a 20 inch wheel ? TIA.


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Old 01-02-09, 08:45 PM   #10
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gear inches = (chainring/sprocket) * tyre diameter

eg. if you have 20x1.5" the diameter is (406/25.4) + (2*1.5) = 19"
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Old 01-02-09, 09:10 PM   #11
rhenning
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11 divided into 60 X wheel diameter 20 equals gear inches 110.

60/11=5.5*20=109 I have 451 wheels which equal 20 diameter. Roger

Last edited by rhenning; 01-02-09 at 09:13 PM. Reason: Math mistake
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Old 01-02-09, 10:49 PM   #12
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You have the possibility for either 406 mm wheels or 451 mm wheels. I have a road single speed bicycle set for 5.3 gain ratio (451 mm wheels, 170 mm crank length, 52 teeth chain ring, 15 teeth sprocket) and I am fairly please with the "do it all drive train setting". I suppose you can feel a more road like response on a 451 mm wheel than on a 406 wheel.

A picture on me riding the 65 km around the Sea of Galilee in 2008.

http://www.shvoong.co.il/imageFromEv...ate=01/11/2008

PS: If you fellas want to see more pictures of the event

http://www.shvoong.co.il/imageFromEv...owSearch=False

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Old 01-03-09, 05:56 AM   #13
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11 divided into 60 X wheel diameter 20 equals gear inches 110.
60/11=5.5*20=109 I have 451 wheels which equal 20 diameter. Roger
(406) 20 x 1.5" = 19" diameter
(451) 21 x 1 3/8" = 20.5" diameter
big difference.
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Old 01-03-09, 07:59 AM   #14
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I use 1 1/8 Schwalbe tires. Roger
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