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Search: Posts Made By: Dave Mayer
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08-16-22, 12:13 PM
Replies: 14
Views: 219
Posted By Dave Mayer

I am a mechanic at a big-city bike Co-op. Do...

I am a mechanic at a big-city bike Co-op. Do this. I've done this hack many times, and when properly adjusted, you won't be able to tell the difference from a new headset. Doing the loose ball...
08-15-22, 01:17 PM
Replies: 8
Views: 109
Posted By Dave Mayer

I own several high-end vintage bikes. I also...

I own several high-end vintage bikes. I also work as a mechanic at a bike co-op and I service many older bikes every week.

As far as for riding, you do not want an old Campagnolo freewheel,...
08-02-22, 11:15 AM
Replies: 18
Views: 371
Posted By Dave Mayer

Ummm.. is picture #2 your cassette? If it is,...

Ummm.. is picture #2 your cassette? If it is, then someone has taken 9 or 10-speed Campy cassette cogs, removed the original spacers and one or 2 cogs, and converted it to a 8-speed cassette.

If...
Forum: Road Cycling
07-25-22, 10:10 AM
Replies: 78
Views: 2,203
Posted By Dave Mayer

Exactly. You are drafting someone else at least...

Exactly. You are drafting someone else at least 90% of the time, so aero is not as important. But on the climbs and punchy accelerations out of corners, light weight absolutely rules. You need to...
07-24-22, 11:47 AM
Replies: 9
Views: 301
Posted By Dave Mayer

I own a Vitus 979; one of my favorite bikes,...

I own a Vitus 979; one of my favorite bikes, despite having a fleet of carbon things. It takes a 25.0 post. Attempting to install a 25.4 or larger may be possible if you have a pneumatic press...
07-23-22, 10:55 AM
Replies: 55
Views: 1,070
Posted By Dave Mayer

Sigh.. so much angst.. Here is the only safe...

Sigh.. so much angst..

Here is the only safe and reliable approach: wrap new chain tight directly around the big-big cogs. Determine the tightest possible way of connecting the chain, and then...
07-20-22, 04:43 PM
Replies: 35
Views: 1,554
Posted By Dave Mayer

Adventures in replacing hub cartridge bearings ...

Adventures in replacing hub cartridge bearings

Been through every one of these - several times:

Cannot remove bearing because it is corroded tight into the hub shell. Removal efforts...
Forum: Road Cycling
07-20-22, 01:51 PM
Replies: 51
Views: 1,619
Posted By Dave Mayer

Precise language: your Chris King BB was not a...

Precise language: your Chris King BB was not a 'bunch of parts', but consisted of 2 cups which threaded into the bike frame. In each of those cups, there was a single cartridge bearing that had been...
07-20-22, 12:02 PM
Replies: 35
Views: 1,554
Posted By Dave Mayer

How long can a set of cup and cone hubs last? ...

How long can a set of cup and cone hubs last?

Several of the posters here have claimed that cartridge-bearing hubs are superior (not) because the bearings can be replaced if they go bad, whereas...
Forum: Road Cycling
07-20-22, 11:39 AM
Replies: 51
Views: 1,619
Posted By Dave Mayer

Sigh.. all current bottom brackets are press-fit....

Sigh.. all current bottom brackets are press-fit. So even if you buy something threaded, the 2 cartridge bearings at the core of the BB have been press-fit into their BB shells. Even current...
07-15-22, 02:46 PM
Replies: 2
Views: 204
Posted By Dave Mayer

Proper shifting depends on the rear derailleur...

Proper shifting depends on the rear derailleur matching the shifters. Not all derailleurs perform the same, even within the Campy timeline.

For example, Campy changed their derailleur geometry in...
07-13-22, 12:27 PM
Replies: 149
Views: 3,838
Posted By Dave Mayer

I have. The fatter tires are also heavier, so...

I have. The fatter tires are also heavier, so more critical rotating mass. They also present more frontal area, so more wind resistance; wind resistance by far consumes the most watts of a solo...
07-13-22, 11:30 AM
Replies: 149
Views: 3,838
Posted By Dave Mayer

Dumbest things I've been told: Bike weight...

Dumbest things I've been told:

Bike weight doesn't matter. This comment invariably comes from some old guy whose 30-pound bike is bristling with impediments such as racks, fenders, riser stems,...
Forum: Road Cycling
07-09-22, 10:46 AM
Replies: 4
Views: 204
Posted By Dave Mayer

Scott SBR Mathauser pads with the magnesium...

Scott SBR Mathauser pads with the magnesium finned holders. Work great on my Campy dual-pivot brakes. Pads can be replaced.

Buy new; I've seen a couple at our local Co-op with cracked holders.
07-02-22, 10:55 AM
Replies: 36
Views: 1,122
Posted By Dave Mayer

Excellent! I did not know about Travel Agents,...

Excellent! I did not know about Travel Agents, which could allow me to install XTR V's on my 'cross bikes. Aside from avoiding constant squeaking, squealing and rubbing, another benefit of the...
07-01-22, 09:34 PM
Replies: 36
Views: 1,122
Posted By Dave Mayer

OK... precise terminology required. On every set...

OK... precise terminology required. On every set of canti and V-brakes I am aware of, the arms have a simple hole in the bottom that is lined with brass or steel. On brake installation, this hole...
07-01-22, 11:42 AM
Replies: 36
Views: 1,122
Posted By Dave Mayer

I just picked up a set of XTR 951 V-brakes. They...

I just picked up a set of XTR 951 V-brakes. They were covered in goo and were sticky inside. So I took the hour per pair and disassembled and serviced these right down to the tiny ball bearings. ...
06-30-22, 09:28 PM
Replies: 48
Views: 1,381
Posted By Dave Mayer

I spent much of yesterday helping customers that...

I spent much of yesterday helping customers that had existing performance bike achieve a more upright position, and lower gearing. This involved changing out the drop bars for flat bars, adding...
06-30-22, 10:55 AM
Replies: 48
Views: 1,381
Posted By Dave Mayer

On a carbon road bike there is no place to mount...

On a carbon road bike there is no place to mount fenders, except those insecure and ineffective clip-on jobs. There is no tire/frame clearance to mount functional fenders either. No place to mount...
06-29-22, 03:19 PM
Replies: 48
Views: 1,381
Posted By Dave Mayer

Our local shops on average will give you a basic...

Our local shops on average will give you a basic fit, and might be willing to swap (like for like) stems if it doesn't involve changing out all the cables and housing runs. They also provide...
06-28-22, 07:52 PM
Replies: 7
Views: 347
Posted By Dave Mayer

I just did a cleaning of a BB72-41. A customer...

I just did a cleaning of a BB72-41. A customer had thrown it away; it didn't feel too crunchy, but water had definitely got inside the frame and left a grimy mess.

It only took a few minutes to...
06-23-22, 11:52 AM
Replies: 4
Views: 219
Posted By Dave Mayer

Mid-range Shimano stuff is one of the great...

Mid-range Shimano stuff is one of the great bargains in cycling. I would never take Joytech over Shimano, unless the Shimano hubs or the rest of the wheel components were worn out or the rims...
06-23-22, 11:41 AM
Replies: 16
Views: 602
Posted By Dave Mayer

Shimano Uniglide cassette hub.. I rode on these...

Shimano Uniglide cassette hub.. I rode on these for years. Good system, and superior to freewheel hubs as explained above.

You'll need to keep the #1 threaded cog to hold everything together;...
06-17-22, 02:07 PM
Replies: 27
Views: 927
Posted By Dave Mayer

Please tell.... Fundraising is critical to...

Please tell....

Fundraising is critical to the finances of a Co-op, as are collaborations with schools and businesses that want bike educational sessions.

Again to reiterate: you want to keep...
06-16-22, 01:30 PM
Replies: 1
Views: 103
Posted By Dave Mayer

I have successfully serviced many Ergopower...

I have successfully serviced many Ergopower shifters. Not to be unhelpful, but if these are the Escape mechanism shifters, I would cut my losses and abandon any further work on these.

I would try...
Forum: Touring
06-14-22, 07:30 PM
Replies: 20
Views: 1,012
Posted By Dave Mayer

I volunteer at a big city high volume bike Co-op....

I volunteer at a big city high volume bike Co-op. Our mission is to recycle, reuse and provide low-cost bike solutions for the community.

Please do NOT donate your worn and/or mangled chain to...
06-14-22, 12:38 PM
Replies: 21
Views: 857
Posted By Dave Mayer

Having a chemistry degree, I find it frustrating...

Having a chemistry degree, I find it frustrating that the discussion keeps circling back to water and water-based 'degreasers' as a solution. Including the inexplicable suggestion to mix a somewhat...
Forum: Road Cycling
06-11-22, 11:41 AM
Replies: 138
Views: 3,465
Posted By Dave Mayer

Last year, I came real close to blowing some...

Last year, I came real close to blowing some unforeseen discretionary fun money on a Giant TCX. But alas, the wheels were hookless, and I could not be bothered negotiating a wheel swap. There are...
06-10-22, 01:06 PM
Replies: 391
Views: 9,816
Posted By Dave Mayer

I volunteer at a big city high-volunteer bike...

I volunteer at a big city high-volunteer bike Co-op. We see large volumes of donations come in every week, many of which are wheelsets. Last week we had some Zonda's and some DT Swiss get dropped...
06-09-22, 11:47 AM
Replies: 5
Views: 208
Posted By Dave Mayer

Just by pure coincidence, I am attempting to...

Just by pure coincidence, I am attempting to revive a Stan's Notubes ZTR Alpha 340 wheelset, which includes a Stan's 3.30R freehub. My freehub is labelled: CHO-13 and SEN-07. A little research...
06-08-22, 02:47 PM
Replies: 391
Views: 9,816
Posted By Dave Mayer

? Actually rim-brake specific wheels are easily...

? Actually rim-brake specific wheels are easily 100 grams lighter. Compare the specs for Campagnolo/Fulcrum wheels, which has about the best engineering/QC control of anyone, and rim and disc-brake...
06-08-22, 11:16 AM
Replies: 391
Views: 9,816
Posted By Dave Mayer

Yes, perspective... Most new road cyclists come...

Yes, perspective... Most new road cyclists come from a MTB background, so 18 pounds is feathery. Coming from a road background, 18 pounds is heavy uncompetitive heavy. I suppose bike weight...
06-08-22, 12:28 AM
Replies: 391
Views: 9,816
Posted By Dave Mayer

I spent much of today riding a current $5k road...

I spent much of today riding a current $5k road bike with discs and 32mm tires (GP 5000s). The bike is a boat anchor; at over 18 pounds it weighs about 2 pounds more than a similarly spec'd and...
06-07-22, 07:11 PM
Replies: 6
Views: 196
Posted By Dave Mayer

A cassette that goes to 36 teeth exceeds the...

A cassette that goes to 36 teeth exceeds the capacity of your 105 rear derailleur. If you have the older 105 (5800 long cage) unit, the maximum rated capacity is 32t. If you have the newer 7000...
06-04-22, 07:08 PM
Replies: 21
Views: 722
Posted By Dave Mayer

I have built many wheels from scratch, and...

I have built many wheels from scratch, and revived more by replacing (just) the rims. These do not look like deep scratches, and if you ride a few hundred miles, especially in the rain, they'll be...
06-03-22, 12:23 PM
Replies: 63
Views: 1,383
Posted By Dave Mayer

I have coached many new cyclists, and the OP...

I have coached many new cyclists, and the OP raises an important point that confuses many. When you push on the left shifter, which controls the front derailleur, it makes the bike 'faster' as the...
06-03-22, 12:08 PM
Replies: 21
Views: 857
Posted By Dave Mayer

Yeah, gasoline is a better degreaser than mineral...

Yeah, gasoline is a better degreaser than mineral spirits. Somewhat more flammable - responsible adult precautions apply.

My go-to solvent for really tough jobs is white gas, otherwise marketed...
06-03-22, 01:00 AM
Replies: 21
Views: 857
Posted By Dave Mayer

Solubility - Wikipedia...

Solubility - Wikipedia (https://en.wikipedia.org/wiki/Solubility)

Summary: 'like dissolves like'. Non-polar molecules (hydrocarbons such as grease and oils) have minimal solubility in strongly...
06-02-22, 11:23 AM
Replies: 21
Views: 857
Posted By Dave Mayer

Chemist here... Water-based solutions are...

Chemist here... Water-based solutions are inherently poor at degreasing. Chemistry 101. Mineral spirits (a petroleum cut) are relatively good compromise in terms of degreasing effectiveness, toxicity...
05-26-22, 11:58 AM
Replies: 10
Views: 525
Posted By Dave Mayer

I've been riding some Campy Record 8-speed...

I've been riding some Campy Record 8-speed Ergopower shifters for the last week or so on a Vitus 979. Bike rides great and the shifting is flawless. Campagnolo totally had their act together by...
Forum: Road Cycling
05-20-22, 12:19 PM
Replies: 35
Views: 1,192
Posted By Dave Mayer

I'm roughly in the same situation as you. Older,...

I'm roughly in the same situation as you. Older, and I ride almost every day, sometimes in fast groups on the road. Advice:



Bicycling is inherently dangerous. Some situations are more...
05-20-22, 11:52 AM
Replies: 16
Views: 585
Posted By Dave Mayer

I agree that the errant spoke should be dealt...

I agree that the errant spoke should be dealt with. This is a 5-minute job; you don't even have to take the tire off or even take the wheel off of the bike.

When you unwind the offending spoke, do...
05-17-22, 11:54 AM
Replies: 5
Views: 202
Posted By Dave Mayer

I have many bikes running Campagnolo Ergopower....

I have many bikes running Campagnolo Ergopower. The front shifting is not indexed, and the front shifter produces about a dozen 'clicks' across its range. So you can install basically any road...
05-13-22, 03:01 PM
Replies: 27
Views: 927
Posted By Dave Mayer

Thanks. You would think that helping low-income...

Thanks. You would think that helping low-income folks fix bikes themselves would be more than enough of a mission for a Co-op. However, when the social justice activists take power within the...
05-13-22, 12:41 PM
Replies: 27
Views: 927
Posted By Dave Mayer

Local shops will donate useful used parts and...

Local shops will donate useful used parts and surplus inventory to you if you establish a good initial relationship. If you are serving a low-income/classic and vintage/cheap hobbyist demographic,...
05-05-22, 02:22 PM
Replies: 14
Views: 395
Posted By Dave Mayer

Van: If I thought I needed to apologize for the...

Van: If I thought I needed to apologize for the reams of off-topic 'advice' you've received in this thread, I would.

Back to the issue of freehub compatibility: I also volunteer at a Co-op and...
Forum: Road Cycling
05-01-22, 03:49 PM
Replies: 76
Views: 2,543
Posted By Dave Mayer

Trek's Emonda SLR 9 with rim brakes come in at a...

Trek's Emonda SLR 9 with rim brakes come in at a weight of 5.88 kg or 12.96 lbs.. So a 6.8kg disc brake bike is porky.

Note that the Emonda comes stock with clincher (tubeless) yuck wheels. ...
04-27-22, 10:24 AM
Replies: 4
Views: 174
Posted By Dave Mayer

35 was the smallest made; I'm looking at some...

35 was the smallest made; I'm looking at some that are nestling in their brown paper sleeves. Don't ask.

A cool trick with the Victory/Triomphe was to construct a triple using a 35/ 42 /53 with...
04-26-22, 03:50 PM
Replies: 37
Views: 792
Posted By Dave Mayer

This morning I just happened to be working on a...

This morning I just happened to be working on a bike that needed a shifter upgrade. The shifters were the old Grip-Shift X-Ray units matched with Shimano XT derrailleurs. Upshifting was sticky and...
04-22-22, 01:22 PM
Replies: 15
Views: 573
Posted By Dave Mayer

What to avoid? Disc brakes. They have value in...

What to avoid? Disc brakes. They have value in (real) mountain biking applications, the definition of mountain biking being you are travelling at high speed over head-sized rocks down a 30%+ slope....
Showing results 1 to 50 of 1000
 


 
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