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Search: Posts Made By: Flinstone
Showing results 1 to 50 of 276
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Forum: Fitting Your Bike
08-16-17, 08:51 PM
Replies: 8
Views: 1,566
Posted By Flinstone

I posted about this recently. Yes, the two...

I posted about this recently. Yes, the two together along with stack, give reach, but CC doesn't provide seat tube angle but it does provide saddle nose to rear of handlebar.

This can be used to...
Forum: Fitting Your Bike
08-07-17, 08:18 PM
Replies: 27
Views: 6,807
Posted By Flinstone

McBTC your plots don't mention efficiency only...

McBTC your plots don't mention efficiency only max power. It's not clear that max power has much at all to do with one hour sustained power. 1 hour power certainly does involve efficiency.
...
Forum: Fitting Your Bike
08-06-17, 11:30 PM
Replies: 27
Views: 6,807
Posted By Flinstone

Don't take that as fact. I don't know. If...

Don't take that as fact. I don't know. If you've done cadence builds and tried to hit 180rpm, you get the sense that just making your legs change direction that quickly is very tiring, but I can't...
Forum: Fitting Your Bike
08-06-17, 10:48 PM
Replies: 27
Views: 6,807
Posted By Flinstone

Higher foot speeds don't result from longer...

Higher foot speeds don't result from longer cranks. Higher foot speeds result from moving your feet faster. Ok, ok, maybe you mean for the same RPM and same power, you need higher foot speed and...
Forum: Fitting Your Bike
08-01-17, 07:52 AM
Replies: 27
Views: 6,807
Posted By Flinstone

And yes I'm aware that the geometrical...

And yes I'm aware that the geometrical constraints related to wheel size are also related to mass production cost cutting or at least corner cutting constraints. Constraints none the less.
Forum: Fitting Your Bike
08-01-17, 07:46 AM
Replies: 27
Views: 6,807
Posted By Flinstone

You make some good points. You're right about...

You make some good points. You're right about the C.G. The women's study didn't show any negative impact of short cranks. the 145 to 170 study did but you mischaracterized it. They only showed...
Forum: Fitting Your Bike
07-31-17, 07:47 PM
Replies: 12
Views: 9,834
Posted By Flinstone

By the way, here is the canondale chart.. oops,...

By the way, here is the canondale chart.. oops, link didn't work, well just click geometry from their website listing.

From 52 to 50 the top tube length only decreases 1.2cm, easily an amount...
Forum: Fitting Your Bike
07-31-17, 06:41 PM
Replies: 12
Views: 9,834
Posted By Flinstone

@UCDHacker, I just went through comparing the...

@UCDHacker, I just went through comparing the "race" road bike geometries in Cervelo, Canondale, Trek and Specialized
I didn't exactly write down detailed conclusions, but the notes I wrote were...
Forum: Fitting Your Bike
07-30-17, 06:57 PM
Replies: 4
Views: 2,037
Posted By Flinstone

Don't get me wrong, stack and reach are still the...

Don't get me wrong, stack and reach are still the best way to choose a frame, it's just that I don't think a calculator can determine your needed/desired stack and reach very well at all, while I...
Forum: Fitting Your Bike
07-30-17, 06:26 PM
Replies: 4
Views: 2,037
Posted By Flinstone

Yes, I've also noticed that source of error. ...

Yes, I've also noticed that source of error. However, I don't know how you get around that. Depending on the curvature of your sit bones , the tilt of your pelvis, and the shape of the seat, the...
Forum: Fitting Your Bike
07-29-17, 06:31 PM
Replies: 2
Views: 2,103
Posted By Flinstone

I notice that the geometries google conjures up...

I notice that the geometries google conjures up for the sempre pro and 928 as given by bianchi are almost identical, within a mm here and there, with the STA the same. The good thing though on the...
Forum: Fitting Your Bike
07-29-17, 08:34 AM
Replies: 27
Views: 6,807
Posted By Flinstone

oh, and all this is from a 14% change in leverage.

oh, and all this is from a 14% change in leverage.
Forum: Fitting Your Bike
07-29-17, 06:39 AM
Replies: 27
Views: 6,807
Posted By Flinstone

Whatever you did made things better for you so...

Whatever you did made things better for you so great. However a 20% increase in speed if you were already fast? If you're already fast then you're fighting mostly wind and a 20% increase in speed...
Forum: Fitting Your Bike
07-29-17, 05:38 AM
Replies: 27
Views: 5,399
Posted By Flinstone

For what it's worth, I crunched the numbers on...

For what it's worth, I crunched the numbers on REI's website for the size S 2017 version, which has a listed TT of 525, presumably the one referred to in the OP. Using the listed reach, STA, and...
Forum: Fitting Your Bike
07-29-17, 05:11 AM
Replies: 4
Views: 2,037
Posted By Flinstone

competitive cyclist provides stack,reach,STA

Any discussion of the competitive cyclist fit seems to have most people saying it's pretty ok and a few folks reasonably pointing out that tube lengths are meaningless without seat tube angle (STA). ...
Forum: General Cycling Discussion
08-07-16, 11:23 PM
Replies: 65
Views: 12,087
Posted By Flinstone

I don't think within reasonable bounds that...

I don't think within reasonable bounds that there's really any such thing as a bike that's "just slow". Knobby tires will eat up actual energy. A terrible riding position, seat way too low or high,...
Forum: General Cycling Discussion
08-07-16, 07:14 AM
Replies: 44
Views: 4,356
Posted By Flinstone

Beauty to me for something that isn't purely art,...

Beauty to me for something that isn't purely art, requires first that it be designed with care and skill to achieve its purpose. At least one of those bikes can't even turn. Actually that might be...
Forum: Road Cycling
08-07-16, 05:30 AM
Replies: 244
Views: 13,777
Posted By Flinstone

So this means the tech is developed for the mass...

So this means the tech is developed for the mass market, period, with the need to make sure it's portrayed as useful to pros first, because, that's what makes the mass market buy it. BUT that...
Forum: Bicycle Mechanics
08-05-16, 08:35 PM
Replies: 73
Views: 5,209
Posted By Flinstone

That said I will say that strength training IS...

That said I will say that strength training IS productive in my opinion. Be careful reading pro boards. They are already at top performance and balance every training session with what else they...
Forum: Bicycle Mechanics
08-05-16, 08:24 PM
Replies: 73
Views: 5,209
Posted By Flinstone

Yep. Everyone who goes up the same hill at the...

Yep. Everyone who goes up the same hill at the same speed, with same weight needs the same amount of power, regardless what gear they do it in. Some people are poor at high cadence power. Some are...
Forum: Bicycle Mechanics
08-05-16, 08:03 PM
Replies: 54
Views: 3,883
Posted By Flinstone

Anyway, read my edits above. My comment was...

Anyway, read my edits above. My comment was never about you. That's the touchy bit.
Forum: Bicycle Mechanics
08-05-16, 08:00 PM
Replies: 54
Views: 3,883
Posted By Flinstone

no, weird is your personal extrapolation - this...

no, weird is your personal extrapolation - this thread is not about me, this thread is not about you
Forum: Bicycle Mechanics
08-05-16, 07:46 PM
Replies: 54
Views: 3,883
Posted By Flinstone

The only thing weird is how touchy you seem about...

The only thing weird is how touchy you seem about it. It's all good. It's funny how we don't realize typing isn't speaking. In conversational speech we instinctively expect people to pick up things...
Forum: Bicycle Mechanics
08-05-16, 07:38 PM
Replies: 54
Views: 3,883
Posted By Flinstone

Any chance you're cross chained when this...

Any chance you're cross chained when this happens? You aren't trying to shift to the smallest cog while on the smallest ring are you? Not that it necessarily causes problems, but it can amplify...
Forum: Bicycle Mechanics
08-05-16, 07:27 PM
Replies: 54
Views: 3,883
Posted By Flinstone

Yeah so, it's either on the small cog, or it's...

Yeah so, it's either on the small cog, or it's past it over and off. The difference can be a pretty tiny adjustment. edit: ok.. I didn't look closely enough.
Forum: Bicycle Mechanics
08-05-16, 07:08 PM
Replies: 73
Views: 5,209
Posted By Flinstone

I didn't read the whole thread, but the 2016 10...

I didn't read the whole thread, but the 2016 10 speed tiagra group in the long cage variant of course, accepts the biggest rear cog of any shimano road set, It accepts a 34 even on paper, probably...
Forum: Bicycle Mechanics
08-05-16, 06:25 PM
Replies: 54
Views: 3,883
Posted By Flinstone

I do wonder if adjusting the vertical spacing...

I do wonder if adjusting the vertical spacing between the upper jockey wheel and the cogs (b screw) would help, specifically bringing the wheel closer. This might keep the chain a little more...
Forum: Bicycle Mechanics
08-05-16, 05:53 PM
Replies: 54
Views: 3,883
Posted By Flinstone

I seem to have offended, didn't mean to. You...

I seem to have offended, didn't mean to. You said you avoid shifting this way now. Either I should too because it's a bad idea generally speaking, or there is more to what caused your particular...
Forum: Bicycle Mechanics
08-05-16, 08:48 AM
Replies: 54
Views: 3,883
Posted By Flinstone

What exactly was dumb about the shift? I shift...

What exactly was dumb about the shift? I shift front and rear simultaneously almost every single time I shift the front. It's not a problem, and I think it's pretty common trick with doubles,...
Forum: Bicycle Mechanics
08-05-16, 08:23 AM
Replies: 66
Views: 6,411
Posted By Flinstone

Well, roadies do tend to wear lycra and think...

Well, roadies do tend to wear lycra and think they look cool in it, but I wouldn't generalize quite so much.
Forum: Bicycle Mechanics
08-04-16, 07:31 AM
Replies: 66
Views: 6,411
Posted By Flinstone

Are you kidding? I would have serious domestic...

Are you kidding? I would have serious domestic issues. Unless you have someone you can pay for a lift, who would have patience to frequently stop what they're doing and pick you up because you...
Forum: General Cycling Discussion
07-14-16, 02:33 AM
Replies: 75
Views: 6,778
Posted By Flinstone

I get your point in the sense that in the middle...

I get your point in the sense that in the middle of all that who can notice, but actually frequent starts and hills are the only times a few pounds matter at all. 5% easier starting when tired sound...
Forum: General Cycling Discussion
07-14-16, 02:11 AM
Replies: 75
Views: 6,778
Posted By Flinstone

I was agreeing with you. Bike part weights don't...

I was agreeing with you. Bike part weights don't matter much (yes, meaningless at speed on a flat). Weights of very large humans can.
Forum: General Cycling Discussion
07-13-16, 05:03 PM
Replies: 75
Views: 6,778
Posted By Flinstone

This... to a point. If your setup is 400lbs,...

This... to a point. If your setup is 400lbs, you're past that point (because of tire deformation and likely having a huge aero cross section, and because acceleration probably does start to matter...
Forum: General Cycling Discussion
07-13-16, 05:35 AM
Replies: 29
Views: 3,803
Posted By Flinstone

Only two of these were mildly meaningful...

Only two of these were mildly meaningful (whizzing on a bike, and not adding weight need to be said?) and as others have said, those two aren't so bad anyway. Forearms on the top bars is fine. It...
Forum: Bicycle Mechanics
07-12-16, 04:52 PM
Replies: 49
Views: 2,963
Posted By Flinstone

You clearly cannot ride the bike in that...

You clearly cannot ride the bike in that condition. You should get a scratched up old bike instead of your pristine new one. Then you won't need medical expenses for counseling and you'll be able...
Forum: Bicycle Mechanics
07-11-16, 06:21 PM
Replies: 35
Views: 3,512
Posted By Flinstone

The neat thing about this is maybe what a great...

The neat thing about this is maybe what a great example it is of how the concepts of simple deceleration: m*a, energy: 1/2mv^2 and momentum: m*v obviously all achieve the same end effect in some...
Forum: Singlespeed & Fixed Gear
07-11-16, 05:41 PM
Replies: 82
Views: 60,111
Posted By Flinstone

It's been pointed out that the quote I replied...

It's been pointed out that the quote I replied did go on to describe radial forces from the bike decelerating. So let's just say I would have said the first line differently and I'm just...
Forum: Bicycle Mechanics
07-11-16, 05:40 PM
Replies: 35
Views: 3,512
Posted By Flinstone

Right you're reacting to it, but I think we agree...

Right you're reacting to it, but I think we agree that it's true. There's essentially an equal and opposite force required at the hub/dropout before even getting to actually pushing backward (in...
Forum: Bicycle Mechanics
07-11-16, 05:37 PM
Replies: 35
Views: 3,512
Posted By Flinstone

Yes, the work and energy goes through the brakes....

Yes, the work and energy goes through the brakes. The deceleration force m*a and the momentum, go through the ground. The forces involved in each only just happen to be about equal for rim brakes...
Forum: Bicycle Mechanics
07-11-16, 05:15 PM
Replies: 35
Views: 3,512
Posted By Flinstone

oh. yes.. actually you're right. My mistake. ...

oh. yes.. actually you're right. My mistake. Anyway I didn't name or quote him for a reason. In this case this was my post, and the hypothetically or actually proposed notion was a starting place....
Forum: Bicycle Mechanics
07-11-16, 05:10 PM
Replies: 35
Views: 3,512
Posted By Flinstone

NOt the quote I used... anyway, no I just made an...

NOt the quote I used... anyway, no I just made an example out what appears to me to be an easy misonception and discussed the MECHANICS involved. Sorry that some are offended by discussion of actual...
Forum: Bicycle Mechanics
07-11-16, 04:55 PM
Replies: 35
Views: 3,512
Posted By Flinstone

cooker and 79pmooney have it all about right. As...

cooker and 79pmooney have it all about right. As for the conundrum about heat, that's not wrong either. Yes the brake pads dissipate heat and this is an important function because the collision...
Forum: Bicycle Mechanics
07-11-16, 08:57 AM
Replies: 35
Views: 3,512
Posted By Flinstone

Great example. Try this barefoot. It will become...

Great example. Try this barefoot. It will become very clear that your toes are squeezing very hard FORWARD into the fork and are not directly transmitting the force responsible for pushing back on...
Forum: Bicycle Mechanics
07-11-16, 08:39 AM
Replies: 35
Views: 3,512
Posted By Flinstone

I suppose you could say: a) LARGE braking...

I suppose you could say:

a) LARGE braking forces go through the spokes for both disk brakes and rim brakes.
b) braking force as in slowing down the mass of the bike, does not go through the boss,...
Forum: Bicycle Mechanics
07-11-16, 08:28 AM
Replies: 35
Views: 3,512
Posted By Flinstone

Of course it would force the frame down at the...

Of course it would force the frame down at the bosses, and this would be countered by an upward force at the hub. That's the whole point.

If you hold a wheel in your hand with a stick through...
Forum: Bicycle Mechanics
07-11-16, 07:48 AM
Replies: 35
Views: 3,512
Posted By Flinstone

You had a right idea but lost it (next time read...

You had a right idea but lost it (next time read the whole post). Yes forces transmit around the rim, but the force that the rim transmits to the brake is FORWARD. Spin the front wheel forward and...
Forum: Singlespeed & Fixed Gear
07-11-16, 06:49 AM
Replies: 82
Views: 60,111
Posted By Flinstone

To bring this into the modern age I will redirect...

To bring this into the modern age I will redirect discussion to here:

http://www.bikeforums.net/bicycle-mechanics/1071955-where-braking-force-really-comes.html#post18903389


and suggest that...
Forum: Bicycle Mechanics
07-11-16, 06:47 AM
Replies: 35
Views: 3,512
Posted By Flinstone

Where braking force really comes from.

I found this quote somewhere around here.



Not only was it unchallenged but the next poster gave it a +1. Other comments I've seen have pointed at similar misconceptions and it seems worth...
Forum: Singlespeed & Fixed Gear
07-11-16, 06:10 AM
Replies: 82
Views: 60,111
Posted By Flinstone

oh well since YOU said so, and since since it's...

oh well since YOU said so, and since since it's written in stone handed down from God. Old conversations are future google hits. This internet morality does far more harm than good in this...
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