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Search: Posts Made By: Brian Ratliff
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Forum: Road Cycling
06-01-19, 04:14 PM
Replies: 119
Views: 6,114
Posted By Brian Ratliff

A Nuuns tablet plus a couple of scoops of...

A Nuuns tablet plus a couple of scoops of maltodextrin per bottle is what I use. Basically Heed but cheaper.
05-13-19, 05:40 PM
Replies: 78
Views: 6,321
Posted By Brian Ratliff

Their "scoring" scored one MIPS helmet as "safer"...

Their "scoring" scored one MIPS helmet as "safer" than WaveCel... but I don't know what that means. Again, talking about real data, not some opaque "score" between 0 and 100 "points", or 0 and 5...
05-13-19, 10:40 AM
Replies: 78
Views: 6,321
Posted By Brian Ratliff

To be clear, I am not suggesting the Bontrager's...

To be clear, I am not suggesting the Bontrager's results are "better" than VT/MIPS. I am suggesting that the strategy of setting an unknown to zero in the face of uncertainty is not any better than...
05-09-19, 11:06 PM
Replies: 78
Views: 6,321
Posted By Brian Ratliff

All I can say is that Bontrager put out, showing...

All I can say is that Bontrager put out, showing their data and testing methodology. MIPS, who's sales are threatened, has made a lot of noise, taking a lot of pot shots, but presenting no data. Ok,...
Forum: Road Cycling
10-17-18, 12:41 PM
Replies: 63
Views: 2,167
Posted By Brian Ratliff

10 years later and we are all still arguing...

10 years later and we are all still arguing something you can just calculate:
https://www.bikeforums.net/7964748-post49.html
08-26-18, 04:27 PM
Replies: 3,027
Views: 256,186
Posted By Brian Ratliff

I love watching sprinters just destroy breakaway...

I love watching sprinters just destroy breakaway specialists. Accelerates around three people like they are standing still on a 7 second effort 100m from the line.
Forum: Road Cycling
04-12-18, 12:34 PM
Replies: 32
Views: 1,826
Posted By Brian Ratliff

As long as the spokes are not actually slack,...

As long as the spokes are not actually slack, spoke tension does not change wheel stiffness.
Forum: Road Cycling
04-12-18, 12:30 PM
Replies: 32
Views: 1,826
Posted By Brian Ratliff

It's a straight-forward question and your...

It's a straight-forward question and your instincts are correct. Rebuilding with thicker spokes will create a stiffer wheel. Area goes up; force stays the same; spoke stress goes down; strain goes...
Forum: Road Cycling
03-17-18, 06:59 PM
Replies: 17
Views: 1,042
Posted By Brian Ratliff

A $60 shoe isn't going to fit as well as a $200...

A $60 shoe isn't going to fit as well as a $200 shoe. So don't get that into your head.

That said, there are other shoes that are at least as good in quality as Sidi (they'll be the same price)....
Forum: Road Cycling
01-21-18, 06:15 PM
Replies: 10
Views: 1,307
Posted By Brian Ratliff

Your tire pressure is way too low for a 23mm...

Your tire pressure is way too low for a 23mm tire. Your tire is walking around the rim under the pressure of the roller as FBinNY explains. Inflate to the normal riding pressure or higher.

The...
Forum: Road Cycling
01-18-18, 10:13 AM
Replies: 59
Views: 3,309
Posted By Brian Ratliff

I get where bannerjek is coming from. Commutes...

I get where bannerjek is coming from. Commutes are short with lots of stuff happening during the rides. I recently got a cross bike (for the disc brakes), and built up a new wheelset. Didn't know...
Forum: Road Cycling
12-05-17, 04:26 PM
Replies: 81
Views: 2,749
Posted By Brian Ratliff

My problem with parabolic rollers is the...

My problem with parabolic rollers is the material. Not only is plastic more likely to get out of round than aluminum, but I was riding a friend's plastic rollers on my plastic bike and I kept on...
Forum: Road Cycling
11-19-17, 09:27 PM
Replies: 236
Views: 10,754
Posted By Brian Ratliff

For all the arguing, as much as I can follow,...

For all the arguing, as much as I can follow, pretty much everyone is somewhat wrong in this thread.

Freewheel drivetrains are somewhat less efficient than fixed gears for a couple reasons:

1....
Forum: Road Cycling
11-07-17, 02:48 PM
Replies: 26
Views: 3,009
Posted By Brian Ratliff

DuraGlove ET Charcoal Wool w/Black - Defeet...

DuraGlove ET Charcoal Wool w/Black - Defeet International (http://www.defeet.com/duraglove-et-charcoal-wool-w-black/)

40 degrees isn't difficult for gloves. I like wool.
Forum: Commuting
11-02-17, 08:21 AM
Replies: 24
Views: 1,314
Posted By Brian Ratliff

People are overreacting. It's not great though,...

People are overreacting. It's not great though, since you cannot preload the headset bearings. Long term, this will thrash the bearings since the steering tube is rattling around between the...
Forum: Road Cycling
11-02-17, 07:35 AM
Replies: 72
Views: 3,710
Posted By Brian Ratliff

Iíve never used rain pants. Just tights or...

Iíve never used rain pants. Just tights or knee/leg warmers. Riding in the rain isnít bad. The worst part is when you are still dry and about ready to embark. Rain seems so much a big deal when you...
Forum: Road Cycling
11-01-17, 09:03 PM
Replies: 72
Views: 3,710
Posted By Brian Ratliff

I've lived and cycled in rain in the Pacific NW...

I've lived and cycled in rain in the Pacific NW all my life; I have some advice.

First, 30 and 45 degrees are very different temperatures. My rule of thumb is that when rain is added to a...
Forum: Road Cycling
11-01-17, 08:15 PM
Replies: 70
Views: 3,364
Posted By Brian Ratliff

So, I get why you are doing this... trackies do...

So, I get why you are doing this... trackies do the same thing, ride tubulars for high pressure and stability when a flat happens.

But, the issue for descending is going to switch from the tire...
Forum: Road Cycling
09-13-17, 10:39 PM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

"Say one tire..." Lost me at that. Why 10W?...

"Say one tire..."

Lost me at that. Why 10W? Why 10%? Support the numbers.
Forum: Road Cycling
09-13-17, 10:37 PM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

Tire casings got better.

Tire casings got better.
Forum: Road Cycling
09-13-17, 07:06 PM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

And my experience as an engineer has taught me:...

And my experience as an engineer has taught me: "One crappy test not informed by fundamentals wastes everyone's time and costs a lot of money."

If you test, you must be informed by fundamentals....
Forum: Road Cycling
09-13-17, 02:20 PM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

Per the above analysis on my prior post, casing...

Per the above analysis on my prior post, casing probably contributes about 1-3% of the total contact patch area. A super supple track tire will contribute almost nothing (it collapses under its own...
Forum: Road Cycling
09-13-17, 02:15 PM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

It's not going to be a lot. How much can an...

It's not going to be a lot. How much can an uninflated tire support? A fully inflated tire supports ~100lbs (half of an 180lb person with a 20lb bike). The number of pounds an uninflated tire can...
Forum: Road Cycling
09-13-17, 11:56 AM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

I lecture on basic physics when I see people...

I lecture on basic physics when I see people clearly getting the physics wrong. This is all basic stuff; any permutation can be done on both large and small width tires to cancel the effect.
Forum: Road Cycling
09-13-17, 11:54 AM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

I can always put the large tire and the small...

I can always put the large tire and the small tire on the same rim. I do this a lot.
Forum: Road Cycling
09-13-17, 11:52 AM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

I can always make a large tire and a small tire...

I can always make a large tire and a small tire from the same casing. Most tires come in different widths made from the same casing.
Forum: Road Cycling
09-13-17, 11:48 AM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

Yes, the casing supports some weight. Pretty...

Yes, the casing supports some weight. Pretty negligible in the case of a bicycle tire. Bicycles do not go very fast in the scheme of things and tires, even the heaviest duty casings, are very...
Forum: Road Cycling
09-13-17, 08:34 AM
Replies: 227
Views: 9,657
Posted By Brian Ratliff

Some facts: Tires at the same psi will have...

Some facts:

Tires at the same psi will have the same area contact patch. This is basic physics. Pounds per square inch, multiplied by the area of contact, gives you the weight the tire is...
Forum: Road Cycling
08-24-17, 07:47 AM
Replies: 105
Views: 5,139
Posted By Brian Ratliff

Your front tire is what steers your bike. Unless...

Your front tire is what steers your bike. Unless traction is super spotty, you want weight on your front wheel so your bike goes where you want it to go. Try it. Your bike just rails around corners...
Forum: Road Cycling
08-23-17, 10:28 PM
Replies: 105
Views: 5,139
Posted By Brian Ratliff

You are asking the wrong question. You have the...

You are asking the wrong question. You have the yips, a loss of confidence. The way to get out of that bad head space is to get yourself back into descending. You don't do that by over thinking......
Replies: 389
Views: 94,270
Posted By Brian Ratliff

You should have no problem. I was at Carson a few...

You should have no problem. I was at Carson a few weeks ago for Nats. I was riding EVO CS on my race wheels and my normal Tufo road tires on my spare/warmup wheelset. Both worked fine and I had no...
Replies: 5,583
Views: 494,819
Posted By Brian Ratliff

5kph out of 77kph is 6.5% faster on the track...

5kph out of 77kph is 6.5% faster on the track than the road. Power relates to velocity by the cube, so a 6% increase in speed is represented by a 21% increase in power. The difference between 1400W...
Replies: 92
Views: 9,310
Posted By Brian Ratliff

Big gears are clearly better for sprinting....

Big gears are clearly better for sprinting. Roadies have been using huge gears forever in their sprints. All the good sprinters these days are using big gears in their races. I've converted. It's...
Replies: 1,005
Views: 106,184
Posted By Brian Ratliff

One day a week isn't doing you many favors. Lift...

One day a week isn't doing you many favors. Lift more frequently. You don't need nearly as much rest as you think you do. Start small with short workouts and light weights every other day (or maybe...
Forum: Road Cycling
05-22-17, 01:53 PM
Replies: 69
Views: 3,306
Posted By Brian Ratliff

Asked and answered: What Determines Speed on...

Asked and answered: What Determines Speed on Downhills? (http://www.bikeforums.net/6854653-post47.html)
Forum: Road Cycling
03-15-17, 08:13 PM
Replies: 112
Views: 10,518
Posted By Brian Ratliff

Wow. Incorrect. Mold design and manufacturing...

Wow. Incorrect. Mold design and manufacturing process for a $200 helmet is much more complicated than for a $50 helmet. All that cool shaping is very expensive to build into a mold. Your bog standard...
Replies: 20
Views: 2,027
Posted By Brian Ratliff

You only need to stay in your slot for the first...

You only need to stay in your slot for the first lap. This eliminates some of the pointless crashes and restarts at the beginning of the race as people won't be aggressive and start bashing shoulders...
Forum: Road Cycling
02-03-17, 02:28 PM
Replies: 26
Views: 4,270
Posted By Brian Ratliff

Remember the rim is in compression because of...

Remember the rim is in compression because of spoke tension. Single strips of aluminum for a rim will just collapse. And if you thicken it so it doesn't collapse, you can get the same strength for...
Forum: Road Cycling
02-02-17, 02:53 PM
Replies: 26
Views: 4,270
Posted By Brian Ratliff

yes

yes
Replies: 103
Views: 12,174
Posted By Brian Ratliff

A thriving kids program is one in which the...

A thriving kids program is one in which the parents support the program with real money. Free youth programs are great, but they will never build a sport. It's because they rely on donations of, most...
Replies: 103
Views: 12,174
Posted By Brian Ratliff

Cycling, particularly track cycling, is as...

Cycling, particularly track cycling, is as expensive as you make it out to be. A loaner bike, a pair of shoes and a helmet is really all a kid needs when they are young. Parents will pay for stuff...
Replies: 103
Views: 12,174
Posted By Brian Ratliff

Of course not. But I may be more in favor of a...

Of course not. But I may be more in favor of a 166m indoor track than a 250m outdoor track. I actually think the ideal for our environment would be a 400m outdoor all-weather track, like they have in...
Replies: 103
Views: 12,174
Posted By Brian Ratliff

This sentiment is exactly why we have exactly one...

This sentiment is exactly why we have exactly one 250m indoor track in the US. It's a mistake to think riders won't ride a track that's not 250m. In Portland, we have one of the stupidest tracks in...
Replies: 103
Views: 12,174
Posted By Brian Ratliff

Just like a 333 track would really 333.33m in...

Just like a 333 track would really 333.33m in length to make it 3 laps to a kilo, a 166 track would be 166.67m making it 6 laps to a kilo. I am not sure if 333 tracks are actually 333.33m in length,...
Forum: Road Cycling
01-13-17, 10:18 AM
Replies: 122
Views: 7,503
Posted By Brian Ratliff

So... her first mistake is her front roller is...

So... her first mistake is her front roller is way too far forward. Should be as close to being directly below the front axle as possible without being behind it. Much easier to balance if you do...
Replies: 11
Views: 1,622
Posted By Brian Ratliff

Strength matters way more for track sprinting...

Strength matters way more for track sprinting than weight. There was a time when I was transitioning from being a roadie to being a trackie where I would shave 2-3/10ths of a second off my 200m time...
Replies: 203
Views: 57,524
Posted By Brian Ratliff

I have a set of the clincher version... solid but...

I have a set of the clincher version... solid but pretty heavy. Makes a good training wheelset.
Replies: 42
Views: 5,207
Posted By Brian Ratliff

Pop can shim. That's the fix for most seatpost...

Pop can shim. That's the fix for most seatpost slipping issues. Fixed mine on my Dolan Forza. Seatpost slipping is entirely due to the seatpost being undersized for the seat tube. No amount of...
Forum: Road Cycling
08-20-16, 09:23 PM
Replies: 252
Views: 8,854
Posted By Brian Ratliff

The rim does not deform much at the top when you...

The rim does not deform much at the top when you push down on the hub. Rather, the wheel collapses down slightly at the bottom. The rim will not assume an ovalized shape; as seen in the pdf I posted...
Forum: Road Cycling
08-20-16, 09:12 PM
Replies: 252
Views: 8,854
Posted By Brian Ratliff

Waterlaz is correct. You can calculate the amount...

Waterlaz is correct. You can calculate the amount of energy stored in the wheel just by noting the force applied to the hub and measuring the vertical movement of the hub in response to that force....
Showing results 1 to 50 of 1000
 


 
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