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0
votes
3answers
68 views

I am 6ft and riding a firefox kompac. My speed never crosses 18kmph

What is the difference of having larger no of teeth in the front derailleur? does it help in speed and distance covered? Suggest a good hybrid on which I can achieve faster speeds? My budget is $700.
4
votes
2answers
374 views

What are typical max speeds for pro downhill races?

Looking videos like Red Bull Rampage or Mega Avalanche make me wonder about the speeds attained by those pro bikers. How fast they go in straight line sections?
-1
votes
2answers
137 views

What to upgrade to achieve a higher top speed?

I enjoy going fast and my current bicycle tops too early, what kind of upgrades would I need to make to achieve a taller final gear?
2
votes
2answers
189 views

Are folding bikes less efficient than full sized bikes?

I've recently been touring with my Birdy folder, and people constantly ask me if it's hard work to tour on a folding bike. Compared to my normal sized bike (which has the same gearing, 8-speed ...
2
votes
1answer
132 views

How do I choose a light GPS device supporting Strava? [closed]

Up til now I have ridden with Strava running on my mobile phone sitting in a special mobile phone holder which sits up on my handlebars. Now I am looking for a better solution, both more aerodynamic ...
3
votes
3answers
180 views

What sort of bicycle helmet gives me better speed?

I am working to improve my segment times on Strava riding 10km to/from work. My average speed is 32 kmph, and over short segments (1km) I can set avg speed 44 kmph / max 49. Over the last year I ...
0
votes
2answers
232 views

Speed improvement from hybrid bike to road bike over 9km at 30 kmph?

What sort of speed improvement can I expect going from a $1000 hybrid bike (Merida Crossway Striker) to a $2000 road bike (Cannondale CAAD 10 - 105), all other things being equal? Presently I can ...
0
votes
0answers
37 views

What kind of bikes used in tour de france? [duplicate]

Can somebody tell me how the bikes at tour de france are able to move quicker and can somebody specify with the design of such bikes.
1
vote
2answers
203 views

What is the relationship between tyre pressure and weight?

To give an example of what I'm trying to understand: To accelerate to a given speed or maintain that speed with a tyre pressure of e.g. 100PSI requires a certain amount of energy. If that amount of ...
1
vote
2answers
182 views

Multiple Bluetooth Smart sensors for bike?

I just bought a Sports Tracker Smart heart rate monitor that communicates via Bluetooth. Then I saw the cadence sensor that also measures speed and distance plus it communicates with Bluetooth Smart. ...
2
votes
3answers
269 views

Bike Speedometer Accuracy [duplicate]

What factors should one look for when purchasing a speedometer? Does wired vs wireless or anything else factor into its accuracy?
7
votes
8answers
1k views

Will increased weight make me go downhill faster?

I have had this question for a while. I want to know how I can get down a hill as fast as I can. So, I was wondering if increasing the weight of a bike increases the speed on downhill stretches, or ...
2
votes
5answers
2k views

Speed and comfort of a racing bicycle?

I just saw this guy called Jason Rourke breaking the record of 112.94mph (181km/h) on his bicycle. I wish I could have such a bicycle to ride, but I have never ridden a racing bicycle with gears. I ...
1
vote
1answer
246 views

Campagnolo Athena 9 speed compatibility?

I own some NOS shifters, Campy Athena 9 speed, from 1998 i guess. do you guys know if I can use it with any campagnolo front/rear derailleur? how do I know what is compatible?
2
votes
2answers
289 views

At what slope will the best bikes keep a constant speed?

At what slope will the best bikers (in terms of aerodynamics) on the best bikes roll at a constant speed at 80 km/h on an asphalt surface on a dry day? The reason for this question is because it gives ...
5
votes
4answers
1k views

Why does reducing bike weight have such an impact on speeds?

I am trying to understand the physics of bike weight. I have just made a switch from an 11Kg road bike to an 8Kg one (obviously there are many more factors and differences between the 2 bikes other ...
4
votes
4answers
1k views

How fast can my bike go?

I have an old mountain bike and want to change to a Pashley style girlie bike. I use my bike to go to the shops, pop to places and go out and about with my dog running along side. I find the seating ...
4
votes
3answers
1k views

difference in aero bar design

I see that there are many types of aero bars, i.e., different designs. I am going to buy one but I am not sure which one is better. Here are two types of aero bar designs: Type1 Type2 The ...
6
votes
8answers
983 views

Why aren't average speeds computed over distance?

Average speed is computed so that average speed = total distance / total time. This means that if you go up a hill, which takes a long time, your average speed drops. This isn't regained on the ...
3
votes
3answers
671 views

Why is cycling on a road so much faster than cycling on a cycle path?

I normally cycle on a cycle path and I struggle to go over 10Mph on my bike for any distance. My Daily commute took me 58 to 42 minutes depending on how much I push myself. This morning and yesterday ...
4
votes
2answers
1k views

What is the braking (stopping) distance for bicycles?

A vehicle driver must keep enough braking distance (aka stopping distance) between him/her and a vehicle in front in order to avoid collision. It depends on the driving speed. What is the braking ...
-5
votes
1answer
155 views

Speed On a Road Bike [closed]

My old (But freakin' awesome) french road bike goes fast, considering that the only times im racing is pretty much against my friends who all have mountain bikes. Needless to say I always win. But I ...
1
vote
1answer
106 views

How can one estimate the length of a commute? [duplicate]

How can a cyclist, new to commuting by bike and not all that experienced in riding, estimate how long a commute will take? Answers will of course vary, and actually riding the commute will tell the ...
3
votes
6answers
7k views

How do I estimate how long it will take me to ride my commute?

How can a cyclist, new to commuting by bike and not all that experienced in riding, estimate how long a commute will take? I have been riding for 4 days to and from work. 156km over over 4 days. I'd ...
2
votes
2answers
368 views

Are flat handlebars stable at high speed?

I live in a mountainous area, and so there are lots of opportunities for descending at high speed. I currently have a bike with drop bars, and when in the drops, I feel very stable doing this. I am ...
8
votes
6answers
882 views

What is the most efficient way to ride up or down hills, and into or away from wind?

I'm trying to work out how hard I should push myself when riding up or down a hill. Similarly, how hard should I push myself when riding into, or away from, or perpendicular to wind? My aim is to ...
0
votes
2answers
346 views

Is there any bicycle that can fly? [closed]

In E.T. the bicycles fly. In old films we see some inventors try to construct a bicycle which flies, with wings similar to a bird's. Yogi bear has a flying ship. See the picture above the site. The ...
7
votes
5answers
2k views

How do you shift your weight when leaning on a turn?

When I turn I usually shift my weight on the same side I'm turning to. To ease the discussion let's assume we are turning left, on a paved road (no mud/gravel/potholes/grease/oil/ice/door traps). I ...
2
votes
4answers
560 views

Do higher speed crashes result in less serious injuries.

I have heard that the severity of injuries tend to decrease while riding a road bike at high speed. An instance of high speed would be like those in the Tour de France. The reasoning behind this idea ...
4
votes
2answers
1k views

How do I descend faster on the straightaway?

I've heard a lot of advice about descending mountain roads involving cornering and braking. I want to know how to go faster when descending on the long straightaway. Is it worth pedaling at speeds ...
17
votes
3answers
3k views

What are the most significant factors affecting downhill cruising speed?

When I'm riding with my friend, I notice that he rolls down hills significantly faster than me. We can be riding next to each other, both in a similar aerodynamic position, but if we both coast he ...
1
vote
2answers
462 views

How do you estimate the speed of Tour de France riders on tv?

I was watching Tour de France with my father (who is a cat 3 racer), and he claimed to be able to estimate how fast the riders were going by observing the cyclist on the screen. I didn't believe him ...
7
votes
6answers
5k views

Does a 700c wheel help you go faster?

Someone suggested going with a 700c wheel to go faster, and after thinking about it I am wondering if a larger wheel actually does go faster. I understand that your gears will cause a wheel to rotate ...
12
votes
5answers
2k views

What skills/drills should I learn to descend faster and more confidently? (for mountain biking)

I've ridden road and mountain bikes for years, and this is my first year riding as a part of a team (and actually doing races). I've been stuck at nearly the same level of skill when descending and ...
5
votes
4answers
2k views

Sources of vibration at high speed in and around rear wheel

I’m experiencing vibration somewhere in the rear half of the bicycle when descending at high speed (say more than 30 mph), and I haven’t been able to pinpoint the cause. Everything looks fine, ...
3
votes
3answers
801 views

Speed and Cadence Bike Sensor Opinions

I'm looking to start tracking my speed and cadence for my iOS app, Cycle Meter. The app works great for distance, time, but is not accurate at all for measuring my speed. So I'm thinking of buying ...
1
vote
2answers
458 views

If not Kona Asphalt Commuter then what?

Recetly I spotted Kona Asphalt Commuter, one of this series here: http://www.konaworld.com/asphalt_commuter.cfm?content=dew_plus Why such bike is so special for me -- because right from the shop I ...
44
votes
24answers
33k views

Why aren't Tour de France riders going any faster?

I was having a look at the average speeds of the winner of the Tour de France over the years on this page. To help things along I put the data into LibreOffice and produced a plot: I put on the ...
3
votes
2answers
5k views

Options for replacing a 7 speed Shimano cassette / chain

I would like to replace my 7 speed HG70 cassette and chain. My problem is that it is increasingly difficult to find quality parts for 7 speed system. My bike is a Trek 970 from 1993, originally with ...
1
vote
2answers
357 views

Speed and the sizes of tires/gears

Does the speed of a normal mountain bike vary according to the diameter of the wheels? If it does, will a larger diameter increase the speed or decrease it? Similarly, if the speed varies according ...
12
votes
4answers
5k views

Why am I slow on flat surfaces?

I've been riding about 300 miles a week for the last 2 years. I'm not riding in races, just riding with friends. I always ride 60+ miles (95+ km), and I'm in excellent shape. I have a low end road ...
15
votes
4answers
2k views

Can I ride faster with a bike jersey?

I normally wear a cotton t-shirt when I ride. If I get a bike jersey, how much difference will the reduced air resistance make at, for example, 20 mph? I realize it's not possible to be precise, but I ...
2
votes
4answers
302 views

Effects of design on speed?

I'd like to understand more about how the design of a bike affects its speed (assume a normal, two-wheeled bike with gears). Can I assume that weight has little effect, on level ground, except when ...
10
votes
3answers
2k views

How fast do you need to be going to get an effective slipstream on a bike?

How fast do you need to be going to get an effective slipstream on a bike?
14
votes
7answers
7k views

What is a reasonable speed for long distances on a bike?

I am curious what a reasonable speed to travel on a bike is. Speed will obviously vary based on the conditions in which you are riding. I am planning on taking the GPS out with me this weekend to ...
15
votes
10answers
18k views

How can you speed a road-bike up?

So, I have an 80's raleigh bike, reassembled from spare parts. I'm wondering what the best way to get more speed out of the bike is. Wheels? Gears? Lighter gear? Different pedals? I'm rather fond ...