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Old 08-08-10, 11:19 AM   #1
RoadRash911
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Top speed 25mph/new chainrings?

Hi. I have a 2010 Windsor Fens which rides great, I average 11mph through hills, BUT I top out at 25 mph pedaling fast in top gear.
My bike specs:
Crankset: Shimano 105 5600 triple for 30 speed, 50/39/30T
Cassette: 2010 Shimano 105 HG5600 10 Speed Cassette 12-25T
Chain: 2010 Shimano CN5600 HG 10 Speed
59cm frame for 6'0" rider
http://www.bikesdirect.com/products/windsor/fens_IX.htm
What do other people have as average and top speed? Is it conditioning, components, or both?
I would like to average over 30mph on flats, and be able to top out higher than that.
From what I read, the number of teeth in the chain ring is what will increase top speed? And that the crank arm length also, to a smaller extent?
Thanks.
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Old 08-08-10, 11:24 AM   #2
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With that gearing, I could hit 33mph easily.
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Old 08-08-10, 11:31 AM   #3
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Ok. I may have hit 27mph pedaling as fast as possible, but it would be more comfortable to sustain it at a lower cadence.
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Old 08-08-10, 11:31 AM   #4
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your definately not pedaling fast enough. get a cadence sensor and see just how fast your pedaling. you can also get a new casette with an 11 tooth top gear.

50/12 combo at 90rpm with 175mm cranks should produce 29.4 mph 50/11 combo at 90rpm will net you 32.1mph
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Old 08-08-10, 11:51 AM   #5
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wow a compact triple, I am sorry but thats the stupidest thing I've heard of, since compact doubles are supposed to replace triples anyway. Defered success gearing.
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Old 08-08-10, 11:59 AM   #6
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I would like to average over 30mph on flats...
So can you average over 400 watts?
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Old 08-08-10, 12:17 PM   #7
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Quote:
Originally Posted by RoadRash911 View Post
Hi. I have a 2010 Windsor Fens which rides great, I average 11mph through hills, BUT I top out at 25 mph pedaling fast in top gear.
My bike specs:
50/39/30T
10 Speed Cassette 12-25T


What do other people have as average and top speed? Is it conditioning, components, or both?
I would like to average over 30mph on flats, and be able to top out higher than that.
Speed isn't about gearing, it's about power and the ability to sustain rpm in a given gear. If you can sustain 25mph riding solo in the flats you're already in an elite class of recreational cyclists. Being able to sustain 30mph for anything over a few minutes would be a serious achievement.

FYI, here's a link to a very informative site that helps analyze the effects of speed, cadence, power and gearing. It might give you some insights.
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Old 08-08-10, 12:26 PM   #8
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wow a compact triple, I am sorry but thats the stupidest thing I've heard of, since compact doubles are supposed to replace triples anyway. Defered success gearing.
What is so stupid about 50/39/30? have you run a gear chart on it? a 52 tooth gets you a whopping 1.3 extra mph at 90rpm in the 11tooth cog. it actually provides really nice spacing with minimal overlap of gears. not everyone is 150lbs
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Old 08-08-10, 12:41 PM   #9
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You should be cranking about 95-100 rpms. That means in 50/12 gets you about 32-33 mph. In other words, if you want go that fast, you need to pedal faster.

And there's nothing wrong with a "compact triple" unless you live someplace with a lot of hills and you wish to go down them at 45 mph. I have a 48t big ring, and don't use smaller than the 19t cog with it unless I'm going downhill or have a tailwind. I'm thinking of going back to my old setup - 46-36-26.
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Old 08-08-10, 01:12 PM   #10
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wow a compact triple, I am sorry but thats the stupidest thing I've heard of, since compact doubles are supposed to replace triples anyway. Defered success gearing.

That's not a compact triple. A compact has a 110 BCD and smaller rings and would be known as a touring crank. A "compact" double has 50/36, 50/34, or 48/34 rings, and there are other possible combinations.

Last edited by Al1943; 08-08-10 at 01:31 PM.
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Old 08-08-10, 01:15 PM   #11
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I would like to average over 30mph on flats, and be able to top out higher than that.
If you could do that you would be ready for the serious pros.
If you want to go faster you need to turn the cranks at a higher rpm, like 90 to 105. A cadence meter would probably help.
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Old 08-08-10, 01:22 PM   #12
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That's not a compact triple. A compact has a 110 BCD and smaller rings and would be known as a touring crank. A "compact" double has 50/36, 50/34, or 48/34 rings, and there are other possible combinations.
well someone posted referencing the above mentioned 50/39/30 as a compact triple, i gathered he was saying the tooth combos were stupid which i disagree with
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Old 08-08-10, 01:28 PM   #13
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Originally Posted by RoadRash911 View Post
...I average 11mph through hills, BUT I top out at 25 mph pedaling fast in top gear. ...
I would like to average over 30mph on flats, and be able to top out higher than that.
I suspect he's doing 25 mph down hills.
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Old 08-08-10, 01:33 PM   #14
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well someone posted referencing the above mentioned 50/39/30 as a compact triple, i gathered he was saying the tooth combos were stupid which i disagree with
Sorry, I made a reference post error. Fixed now.
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Old 08-08-10, 05:12 PM   #15
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90 rpm with 700X23 tires and a 50X12 gearing gives you about 29.6 mph at 90 rpm. If you can do that for an hour then you can make a lot of money racing your bike.
The hour record is about 31mph on a velodrome. http://en.wikipedia.org/wiki/Hour_record
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Old 08-08-10, 05:24 PM   #16
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If you look at racing cyclists riding you will see that they pedal far higher rpm's than you would be doing at 25mph in a 50-12 gear (roughly 70 rpm). I have seen that people with heavier legs sometimes tend to spin slower, but sprint cyclists often have huge legs and still spin. I raced Cat3/4 in the 70's and never had over a 100 inch gear (52/14) yet one crit I raced in had a 29mph average. Most racers would consider "spinning out" to be well in excess of 120 rpm. It's not your gearing holding you back. A larger chainwheel (higher gear) increases your speed for a given rpm. It does not allow you to maintain that rpm.

Lastly, no matter what speed you go spinning is more efficient. When you pedal slower the hard, off-center pedaling tends to create wasteful flexing of the bike and pushes you off a straight line track. The more anaerobic muscle effort does not allow your circulation to supply your muscles fuel and carry away waste as well over an extended ride. The only time you would be pushing a higher gear at lower revs is out of the saddle accelerating or hill climbing.

In any case "It's the rider, not the bike," is as true now as it ever has been.As alluded to above the odds of you ever being able to "average over 30mph" are nil. One hour for a 25 mile time trial is considered very good time, even for an elite rider.

Last edited by cny-bikeman; 08-08-10 at 05:45 PM.
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Old 08-08-10, 05:48 PM   #17
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Unless they have uncommonly long or massive legs, I tend to doubt that anyone who can't do 90 rpm in top gear would get faster if they got a bigger gear, because the required force is just going to go up.

To put it simply, if you can't spin faster and keep it up, what makes you think you can push harder, and keep it up?

It would seem to be a lot easier to redline the existing cogset than to go faster with a 53 ring.

Last edited by garage sale GT; 08-08-10 at 09:13 PM.
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Old 08-08-10, 06:26 PM   #18
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Just as a point of reference,
The fastest cycle time in Ironman Canada, 2009 was Brian Lavelle who completed 112 miles in 4 hours 45 minutes

Average speed: 23.5 miles per hour.

So, Roadrash911, Work on conditioning and technique with what you have got.
Keep a record of your rides and watch your results improve.
Set reasonable achievable goals for yourself, and to keep you humble, have some statistics from the pros.
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Old 08-08-10, 06:26 PM   #19
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Your gearing is fine... you need to work on your spin.
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Old 08-08-10, 06:27 PM   #20
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Your gearing is fine... you need to work on your spin.
You are only going to average 30mph if your last name is Merckx.
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Old 08-08-10, 06:56 PM   #21
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if no one answered the question which I do not think they did, if you cannot pedal a fast cadence which many people cannot it is a good idea to do some cadence work to help this but chainrings.... You can get a double crankset and not have to change your shifter depending on what type of shifters you have. You would want a 53/39 in this case and the 12/25 should still be sufficient for hill climbing. You could also swap out your cassette with an 11-25, 11-26 which would give you that 11 to pedal with the 50 ring. Not sure what crankset you have but chainrings are probably around same price if not close to a used crankset...
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Old 08-08-10, 07:05 PM   #22
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Quote:
Originally Posted by RoadRash911 View Post
Hi. I have a 2010 Windsor Fens which rides great, I average 11mph through hills, BUT I top out at 25 mph pedaling fast in top gear.
My bike specs:
Crankset: Shimano 105 5600 triple for 30 speed, 50/39/30T
Cassette: 2010 Shimano 105 HG5600 10 Speed Cassette 12-25T
Chain: 2010 Shimano CN5600 HG 10 Speed
59cm frame for 6'0" rider
http://www.bikesdirect.com/products/windsor/fens_IX.htm
What do other people have as average and top speed? Is it conditioning, components, or both?
I would like to average over 30mph on flats, and be able to top out higher than that.
From what I read, the number of teeth in the chain ring is what will increase top speed? And that the crank arm length also, to a smaller extent?
Thanks.
Yes, no

Can only be done by a few world class cyclists for more than a few minutes.
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Old 08-08-10, 08:21 PM   #23
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Cadence is a thing that will develop as you get better conditioning.

Remember that if you're working hard and you feel burn in your legs before you start running short of breath, you're probably in too high a gear (and vice versa). The burn means you're producing lactic acid from anaerobic fast twitch muscle fibers and there's not enough circulation to clear out the acid. A lower gear will let you press easier on the pedals, using the much more efficient, oxygen-burning, slow-twitch fibers, and the faster cadence increases circulation.

The world record for anyone riding a traditional upright bike for an hour, on a perfectly smooth closed track, is just under 31 miles. Up through the '80s almost every bike you'd see in a road race had a top gear of at best 53/13 (slightly lower than your 50/12).

The peleton in a pro race can cook at a pace above 30mph, because the people at the front are taking more of the wind resistance and shielding those behind them, and they trade off the front positions regularly.

On a long solo ride (60-80 miles) that's relatively flat I go 18-19 mph, average 15 if you include photo and pee breaks.

Ways to go faster on the flat: aerobars, tandems, recumbents, ride in a paceline, draft a bus.

Last edited by zzyzx_xyzzy; 08-08-10 at 08:34 PM.
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Old 08-08-10, 08:32 PM   #24
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Good grief OP. Pedal faster. My top gear is 50/14 and I top out at about 32mph (downhill) and I'm 62 years old. What's your excuse?
If you could average 30mph on the flat you'd be in this year's world championships.
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Old 08-08-10, 08:41 PM   #25
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Just as a point of reference,
The fastest cycle time in Ironman Canada, 2009 was Brian Lavelle who completed 112 miles in 4 hours 45 minutes
Average speed: 23.5 miles per hour.
A better point of reference - the best timetrialist in the UK - Michael Hutchinson, June 11th, - 100 miles, 3hours 23min 04sec. Best woman - Julia Shaw 3hr 45min 22sec (competition record).

http://www.cyclingtimetrials.org.uk/...6/Default.aspx

Last edited by Mike T.; 08-08-10 at 08:49 PM.
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