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Search: Posts Made By: Dave Mayer
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03-27-24, 05:27 PM
Replies: 335
Views: 7,391
Posted By Dave Mayer

Sigh.. has anyone here been on fast group rides? ...

Sigh.. has anyone here been on fast group rides? Or raced? On the flats weight doesn't matter obviously. Aero doesn't matter either because you're sheltered in the pack 90+% of the time coasting...
03-26-24, 12:32 PM
Replies: 13
Views: 234
Posted By Dave Mayer

Makes sense, although I've used both Campagnolo...

Makes sense, although I've used both Campagnolo and Miche cassettes extensively, and all things being equal, the Campy cassettes simply shift better. The 2 complete Campy cassettes don't look...
03-26-24, 12:25 PM
Replies: 15
Views: 297
Posted By Dave Mayer

This should work. The longer 'nose' on the...

This should work. The longer 'nose' on the original cone isn't an issue, as long as the cone is designed for a 10 x 1 mm axle and 1/4" ball bearings. Where the balls sit and travel on the cone is...
Forum: Road Cycling
03-26-24, 12:17 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

New posting... Dog whistle! Here boy! Here boy!

New posting... Dog whistle! Here boy! Here boy!
Forum: Road Cycling
03-26-24, 11:52 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

So we're saying that the CPA president makes...

So we're saying that the CPA president makes statements that impedes the ability of the industry to sell the latest and greatest shwag to gold-card weekend warriors? The entire thrust of the...
03-26-24, 11:32 AM
Replies: 13
Views: 234
Posted By Dave Mayer

The first 2 pics show complete Campy 9-speed...

The first 2 pics show complete Campy 9-speed cassettes. Not 8 or 10 or 11 speed; I can tell from the cog shapes.

The third pic shows some Miche cogs that should be 9-speed compatible. Don't...
Forum: Road Cycling
03-24-24, 11:36 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Right on schedule: good rebuttal. Good analysis...

Right on schedule: good rebuttal. Good analysis and data. Good research. Do you know anything about bicycles or the bike industry?

Anyway, off to the shop to actually work on bikes; no time to...
03-24-24, 11:12 AM
Replies: 12
Views: 226
Posted By Dave Mayer

Pressure wash? Good God: no. We see the...

Pressure wash? Good God: no. We see the disastrous consequences of this treatment several times a month at the shop. Grease is blown out of every bearing: headsets, hubs, BB etc. Derailleurs are...
Forum: Road Cycling
03-24-24, 11:01 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Thank you! Yes, there is no reason whatsoever for...

Thank you! Yes, there is no reason whatsoever for someone to be riding on clinchers (regular, tubeless or hookless) where there is money at stake.

This applies to every cycling discipline, whether...
03-23-24, 12:09 PM
Replies: 15
Views: 297
Posted By Dave Mayer

Best hubs ever. I own a few sets, as well as the...

Best hubs ever. I own a few sets, as well as the similar XTR units. The 7700 axle has the standard 10 x 1mm threading. These hubs take 9 x 1/4" balls - so this is all standard stuff. If you find...
03-23-24, 12:01 PM
Replies: 14
Views: 425
Posted By Dave Mayer

I prefer tubulars above any other tire/rim...

I prefer tubulars above any other tire/rim system, mainly for safety. When you have a sudden blowout, the tubular tire stays stuck firm to the rim, as opposed to clinchers, where even if you can...
Forum: Road Cycling
03-23-24, 11:50 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Warnings? About once per week at our shop some...

Warnings? About once per week at our shop some mechanic explodes a tire off of a rim. One guy did it three times in succession, presumably in a destructive tire/rim hookless compatibility test. ...
Forum: Road Cycling
03-23-24, 11:46 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

I don't think you understand what a tubular tire...

I don't think you understand what a tubular tire is, and why the tubular rim is superior in every respect to a clincher rim, hookless or tubeless otherwise.

The advantage in the tubular SYSTEM is...
03-23-24, 12:28 AM
Replies: 335
Views: 7,391
Posted By Dave Mayer

Nope - weight trumps everything. When riding in...

Nope - weight trumps everything. When riding in a pack, the weight penalty of a heavy bike, and especially heavy wheels will shed you off the back. Then you can be aero as a bullet, but you are not...
03-22-24, 09:42 PM
Replies: 335
Views: 7,391
Posted By Dave Mayer

Porky disc brake bikes

The stock 2014 Trek Émonda SLR 10 weighed 4.65kg in a 56cm. How much does the current (disc) Emonda SLR weigh?

Pretty hard to compare bike weights anymore, since manufacturers don't want to post...
Forum: Road Cycling
03-21-24, 11:41 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

The blindingly obvious solution is for the pros...

The blindingly obvious solution is for the pros to ride on tubulars. Tubular rims are more impact resistant, safer and lighter. I've inspected carbon tubular rims after massive impacts such as...
03-20-24, 07:59 PM
Replies: 335
Views: 7,391
Posted By Dave Mayer

If I was looking for another bike, I'd buy used;...

If I was looking for another bike, I'd buy used; I do have an unlimited budget. Here: profound truth. Watch the whole thing, particularly at 3:30:

Why Are The Best Bikes SO Cheap Now?...
03-20-24, 07:48 PM
Replies: 335
Views: 7,391
Posted By Dave Mayer

Peak bike occurred just before the pandemic, the...

Peak bike occurred just before the pandemic, the metric being most bang for the buck. For around $2,200 you could get a Giant TCR KOM with Shimano 105 and a full (good) carbon frame and adequate...
Forum: Road Cycling
03-19-24, 08:08 PM
Replies: 68
Views: 1,602
Posted By Dave Mayer

OK, I don't live in the third world, sorry. The...

OK, I don't live in the third world, sorry. The roller reminds me of chip seal in Alaska.

At our annual gravel race with Cat 5 to 1 starts, everyone is on 25mm tires pumped hard. So no change...
03-19-24, 08:00 PM
Replies: 13
Views: 323
Posted By Dave Mayer

Dura-Ace 7400, including the later 8-speed STI...

Dura-Ace 7400, including the later 8-speed STI shifters have a cable pull of about 10% less than Shimano 600 (per gear). And the 740X rear derailleurs have an actuation ratio of about 10% higher...
Forum: Road Cycling
03-19-24, 07:51 PM
Replies: 68
Views: 1,602
Posted By Dave Mayer

?? It is a roughened drum to simulate roughened...

?? It is a roughened drum to simulate roughened pavement. Look at the pic of the test rig - I would not want to ride on pavement like this. If the profile on the drum was even rougher, then you...
Forum: Road Cycling
03-19-24, 11:38 AM
Replies: 68
Views: 1,602
Posted By Dave Mayer

Continental Grand Prix 5000 S TR 25, 28, 30, 32...

Continental Grand Prix 5000 S TR 25, 28, 30, 32 mm Comparison (bicyclerollingresistance.com) (https://www.bicyclerollingresistance.com/specials/grand-prix-5000-s-tr-comparison)

The results of this...
03-19-24, 10:43 AM
Replies: 32
Views: 834
Posted By Dave Mayer

Good guess. I've replaced cups on a few (good)...

Good guess. I've replaced cups on a few (good) cup and cone hubs such as Dura-Ace and Record. Interestingly, these hubs have 28.0 mm ODs, so fit 6001 cart bearings, if you want to convert your old...
Forum: Road Cycling
03-17-24, 07:42 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Once again, a post with zero information or...

Once again, a post with zero information or analysis. Nothing of substance.

When the UCI posts the results of its current review of hookless, then feel free to provide it here so as to provide...
03-17-24, 07:21 PM
Replies: 24
Views: 467
Posted By Dave Mayer

Exactly. I have seen many rear derailleurs where...

Exactly. I have seen many rear derailleurs where one or both pivots are so corroded that they barely move. Or the 4 pivots in the parallelogram cage are similarly corroded and need some lube to be...
03-17-24, 12:37 PM
Replies: 24
Views: 467
Posted By Dave Mayer

Right, yes the use of a small hex key to rotate...

Right, yes the use of a small hex key to rotate the backing plate before pressing it against the spring is the single most important tip in all of this. This step would drive me crazy until I...
Forum: Road Cycling
03-17-24, 12:23 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Thanks for that contribution to the subject of...

Thanks for that contribution to the subject of hookless and the progress in human knowledge. Among engineers it is the role of professional licensing and regulatory bodies to determine if someone...
Forum: Road Cycling
03-17-24, 11:55 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

If you are an engineer, then you know that...

If you are an engineer, then you know that disparaging the advice or analysis produced by a fellow professional engineer as "childish" or "unprofessional" and "sensational" is itself deeply...
03-17-24, 10:31 AM
Replies: 24
Views: 467
Posted By Dave Mayer

Again, thanks for this useful contribution to...

Again, thanks for this useful contribution to this thread and the task faced by the OP. Another irrelevant and useless waste of thread bandwidth.

The only time derailleur springs get distorted...
Forum: Road Cycling
03-16-24, 11:16 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Right, but he has a solid engineering background...

Right, but he has a solid engineering background in bicycles and components and you don't. He has his own business in engineering and testing bottom brackets and you don't. He has thousands of...
03-16-24, 11:05 PM
Replies: 24
Views: 467
Posted By Dave Mayer

To the OP: ignore most of the previous useless...

To the OP: ignore most of the previous useless contributions to this thread - zero value. Just bores who overvalue their own inexperience.

BTW: Engineering 101 is that metal springs do not change...
03-16-24, 07:23 PM
Replies: 10
Views: 252
Posted By Dave Mayer

At our Co-op we sell a pair of skewers for $5. ...

At our Co-op we sell a pair of skewers for $5. And that is the good ones: the enclosed -cam Shimano units with the alu levers. We have a vast flat of assorted skewers, mostly the open-cam units...
03-16-24, 07:18 PM
Replies: 24
Views: 467
Posted By Dave Mayer

Dura-Ace 7700 and 7800 is outstanding kit, and it...

Dura-Ace 7700 and 7800 is outstanding kit, and it should be restored if at all possible. Some lesser derailleurs are not worth the trouble, but this gear is.

First off, derailleurs should not be...
Forum: Road Cycling
03-15-24, 07:41 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Hmmm. I've looked at the video a dozen times and...

Hmmm. I've looked at the video a dozen times and cannot see evidence that the root cause of the crash was that DeGent had hit something.

I've hit many many objects while riding tubulars,...
Forum: Road Cycling
03-12-24, 12:46 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

I'm not advocating widespread use of of tubulars....

I'm not advocating widespread use of of tubulars. 99.9+% of all riders should be on hooked clinchers. The insurmountable performance and safety advantage of the tubular system is only necessary at...
Forum: Road Cycling
03-11-24, 10:31 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Right on schedule, the industry sycophants,...

Right on schedule, the industry sycophants, apologists and influencers come out. None of whom have ever used tubulars.

Once again, tubeless and hookless is an attempted kludge a of a solution to...
Forum: Road Cycling
03-11-24, 12:13 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

The tubular advantage: yes, it is obvious from...

The tubular advantage: yes, it is obvious from the perspective of weight, impact and pinch flat resistance, manufacturing ease and cost, blowout safety etc., tubulars are superior in every respect. ...
03-10-24, 01:01 PM
Replies: 18
Views: 5,399
Posted By Dave Mayer

I pulled one of my spare 7403 freehubs out and...

I pulled one of my spare 7403 freehubs out and measured: 35mm. It only accepts cassettes with 12 and larger first position cogs.
Replies: 21
Views: 771
Posted By Dave Mayer

One more thing: the Dura-Ace 7400 brakes are as...

One more thing: the Dura-Ace 7400 brakes are as good as single-pivot brakes get, which is pretty mediocre. The next generation: 7403 dual-pivots are about as good as rim brakes get, to date. Much...
Replies: 21
Views: 771
Posted By Dave Mayer

Very nice, or about as nice as a race bike could...

Very nice, or about as nice as a race bike could get in 1993. The Dura-Ace STI shifters produce as clean, crisp and accurate shifts as anything made today, short of electronic. If the shifters are...
Forum: Road Cycling
03-01-24, 11:43 AM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Here: Peak Torque on Bike Marketing, Real...

Here:

Peak Torque on Bike Marketing, Real World Aero Savings and Hookless Dangers (youtube.com)

Tubeless/hookless for performance road cycling is for marketing, manufacturer cost savings and...
Forum: Road Cycling
02-29-24, 10:27 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

We more experienced cyclists have had multiple...

We more experienced cyclists have had multiple blowouts on both clincher (hookless or otherwise) and tubulars. The difference is binary: on the clinchers the result is a desperate struggle to stay...
Forum: Road Cycling
02-27-24, 06:29 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

https://silca.cc/blogs/silca/part-4b...-and-impeda...

https://silca.cc/blogs/silca/part-4b...-and-impedance (https://silca.cc/blogs/silca/part-4b-rolling-resistance-and-impedance)

To summarize the study above, the fastest rolling road tire is pumped...
02-27-24, 06:19 PM
Replies: 61
Views: 1,804
Posted By Dave Mayer

The 8-speed groups did work great. I've owned or...

The 8-speed groups did work great. I've owned or ridden the first gen of road bikes with STI shifters (Dura-Ace and 600), and first-gen Campy Ergopower, both 8-speed. The shifting was and still is...
Forum: Road Cycling
02-27-24, 12:39 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Visited my local bike dealer recently. One of...

Visited my local bike dealer recently. One of the 'big three'. Most of the higher end road and gravel options came hookless, with a small selection of 'approved' tire options. Of course these...
Forum: Road Cycling
02-27-24, 12:03 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

Vittoria Air-Liner Road Test | Bicycle Rolling...

Vittoria Air-Liner Road Test | Bicycle Rolling Resistance (https://www.bicyclerollingresistance.com/specials/vittoria-air-liner#conclusion)

Again, the Vittoria testing.

Note the rolling...
Forum: Road Cycling
02-26-24, 10:14 PM
Replies: 562
Views: 16,483
Posted By Dave Mayer

You are on to something. If you reduce the size...

You are on to something. If you reduce the size of the hooks to zero, you'll save a lot of weight at the most critical part of a bike: rotating weight. The elimination of the hooks also makes the...
Forum: Road Cycling
02-23-24, 07:59 PM
Replies: 156
Views: 5,446
Posted By Dave Mayer

Tubulars with latex tubes have the same rolling...

Tubulars with latex tubes have the same rolling resistance as clinchers with latex tubes. Regardless, the difference between any good road racing tires is only a few watts, a distant third-order...
02-23-24, 07:49 PM
Replies: 17
Views: 696
Posted By Dave Mayer

7+ speed freewheels are the blight of my...

7+ speed freewheels are the blight of my existence. At the Co-op we see at least one broken or badly bent axle per shift. When the rider first notices something funny is going on at the back of the...
02-23-24, 02:15 PM
Replies: 38
Views: 1,673
Posted By Dave Mayer

Thru-axles are not axles, they are simply wheel...

Thru-axles are not axles, they are simply wheel retention devices. The true axle is in the hub, the definition of an axle being something that does not rotate, around which the wheel bearings in the...
Showing results 1 to 50 of 1000
 


 
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