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Search: Posts Made By: diabloridr
Showing results 1 to 50 of 434
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Forum: Tandem Cycling
10-13-22, 09:12 AM
Replies: 16
Views: 1,873
Posted By diabloridr

I think there is a bit more to the combined power...

I think there is a bit more to the combined power and biomechanics of two riders than you've discussed.

Power around a pedal stroke is never constant and differs for each rider, this is one of the...
Forum: Tandem Cycling
06-06-22, 08:38 AM
Replies: 52
Views: 13,631
Posted By diabloridr

If such people exist, I'd recommend they find a...

If such people exist, I'd recommend they find a different sport. *ALWAYS* takes in way too much territory.



It's not just "banter", tandem OEM's are placing their corporate liability on the...
Forum: Tandem Cycling
02-03-22, 12:50 PM
Replies: 18
Views: 5,017
Posted By diabloridr

We used Lightning cranks to get the 165mm needed...

We used Lightning cranks to get the 165mm needed for the stoker cranks. Highly adaptable design, downside is cost. Worth an inquiry.

https://www.lightningbikes.com/cranks/index.html
Forum: Tandem Cycling
11-17-21, 08:32 AM
Replies: 38
Views: 5,574
Posted By diabloridr

Modulus is stress divided by elastic strain. ...

Modulus is stress divided by elastic strain.

Figure 2.8 show that the kevlar bead will inherently stretch and become looser as temperature increases.
Forum: Tandem Cycling
11-16-21, 10:44 AM
Replies: 38
Views: 5,574
Posted By diabloridr

Figure 2.7 isn't valid (as you point out). Figure...

Figure 2.7 isn't valid (as you point out). Figure 2.8 is.
Forum: Tandem Cycling
11-16-21, 09:37 AM
Replies: 38
Views: 5,574
Posted By diabloridr

More importantly, tensile strength drops by about...

More importantly, tensile strength drops by about 10% as Kevlar is heated to 200°F, so stretching should be expected.



That air pressure pushes the rim strip down into the spoke pocket within...
Forum: Tandem Cycling
11-15-21, 12:07 PM
Replies: 38
Views: 5,574
Posted By diabloridr

Often overlooked is the effect of heating on the...

Often overlooked is the effect of heating on the kevlar bead of the tire.

I've also seen the adhesive on Velox rimstrips soften on hot rim, allowing the Velox to migrate and expose portions of the...
Forum: Tandem Cycling
09-29-21, 07:37 AM
Replies: 41
Views: 6,215
Posted By diabloridr

It's more likely the small stoker compartments...

It's more likely the small stoker compartments seen on older tandems were a result of the limited tubing choices and the design knowledge available. Small stoker compartments were used to avoid...
Forum: Tandem Cycling
08-23-21, 07:35 AM
Replies: 12
Views: 4,832
Posted By diabloridr

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/640x480/stand_8bd515d0651c8a5ee60cfee82a29f64b468aa523.jpg

Park PRS-6 stand and base (no longer manufactured) with retrofit Park 100-3D clamp
Forum: Tandem Cycling
08-16-21, 07:40 AM
Replies: 43
Views: 13,660
Posted By diabloridr

>>>This<<< I'd been pondering a drivetrain...

>>>This<<<

I'd been pondering a drivetrain noise on the Macchiato for awhile. I wasn't looking forward to tearing down both bottom brackets and readjusting the belt tension during reassembly, so I...
Forum: Tandem Cycling
06-28-21, 01:41 PM
Replies: 6
Views: 1,620
Posted By diabloridr

Not necessarily. The formula for pipe stress...

Not necessarily.

The formula for pipe stress (which is what your tube is) is Stress = (Pressure X Tube Diameter)/2 X Tube Thickness

Since your decreasing pressure while simultaneously...
Forum: Tandem Cycling
06-17-21, 10:08 AM
Replies: 4
Views: 703
Posted By diabloridr

Accurate on what width rim?

Accurate on what width rim?
Forum: Tandem Cycling
03-21-21, 09:58 AM
Replies: 7
Views: 3,105
Posted By diabloridr

Co-Motion makes a nicely designed stoker...

Co-Motion makes a nicely designed stoker handlebar bag, have you seen it?
Forum: Tandem Cycling
03-15-21, 10:22 AM
Replies: 40
Views: 6,235
Posted By diabloridr

All the higher-end Co-Motion tandems spec the...

All the higher-end Co-Motion tandems spec the Spyre, that was a good enough recommendation for us when were building our Macchiato.




Bingo. Beside removing a potential braking failure mode,...
Forum: Tandem Cycling
03-15-21, 10:13 AM
Replies: 40
Views: 6,235
Posted By diabloridr

Looking at rim heating purely from the influence...

Looking at rim heating purely from the influence on tire pressure ignores the reduction in tube and tire properties (yield strength, tensile strength, stiffness) as temperature goes up.

Softening...
Forum: Tandem Cycling
03-15-21, 10:06 AM
Replies: 19
Views: 6,573
Posted By diabloridr

Beloved stoker and I maintain separate Strava...

Beloved stoker and I maintain separate Strava accounts. She used to ride her single as much as the tandem, but has lost her taste for riding on her own in traffic. She still uploads her trainer rides...
Forum: Tandem Cycling
03-09-21, 10:37 AM
Replies: 40
Views: 6,235
Posted By diabloridr

The point is that "the heat capacity of rims" is...

The point is that "the heat capacity of rims" is a fallacy.

For rim brakes, we should be looking at the heat capacity of the rim + tire + tube system.
Forum: Tandem Cycling
03-08-21, 02:08 PM
Replies: 40
Views: 6,235
Posted By diabloridr

With a 75F increase in temperature, I'd look at...

With a 75F increase in temperature, I'd look at softening of the tube or the rim stripe as possible failure mechanisms.
Forum: Tandem Cycling
03-01-21, 11:29 AM
Replies: 29
Views: 13,490
Posted By diabloridr

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/396x396/16832181_10211927670528337_5731711096265786264_n_0cd4085197f90bf2e94b9fcff42ebe769fae65dd.jpg

2017 Co-Motion Macchiato, linear fade of...
Forum: Tandem Cycling
02-27-21, 05:34 PM
Replies: 6
Views: 984
Posted By diabloridr

Data Point: Conti 4000S ii vs 5000 width

The 28C Conti 4000S ii’s on the Macchiato were due for replacement as the “wear dots” had virtually disappeared.

The 5000 has replaced 4000S ii in Conti’s line-up, so I mounted a set.

I was...
Forum: Tandem Cycling
02-02-21, 08:37 AM
Replies: 8
Views: 1,151
Posted By diabloridr

My wife rides 1 or 2 teeth *trailing* myself (my...

My wife rides 1 or 2 teeth *trailing* myself (my memory is fuzzy)

It's easy to experiment and find what works best for you.
Forum: Tandem Cycling
02-02-21, 08:35 AM
Replies: 14
Views: 1,855
Posted By diabloridr

To add to what others have said, since the timing...

To add to what others have said, since the timing chain does not not shift, there is no need to specify a chain compatible with number of speeds in the current cassette.

6 or 8 speed compatible...
Forum: Tandem Cycling
01-06-21, 09:56 AM
Replies: 9
Views: 1,571
Posted By diabloridr

A well-equipped bike shop or machine shop could...

A well-equipped bike shop or machine shop could install helicoils in the arms to avoid this issue, if you wished to make it a permanent modification.
Forum: Tandem Cycling
10-23-20, 08:34 AM
Replies: 7
Views: 2,266
Posted By diabloridr

Minor nit: This quote should be attributed to...

Minor nit: This quote should be attributed to Colin Chapman, founder of Lotus Motorcars. His degree was in structural engineering.

Another wise Chapman quote is: ""Adding power makes you faster on...
Forum: Tandem Cycling
10-22-20, 10:14 AM
Replies: 10
Views: 2,044
Posted By diabloridr

Several years ago we came to the conclusion that...

Several years ago we came to the conclusion that buying a new tandem was a better strategy than updating an 18 year old machine. Not regretting our decision.



In general, the number-crunchers...
Forum: Tandem Cycling
10-09-20, 09:03 AM
Replies: 19
Views: 3,124
Posted By diabloridr

Not really an option unless your tandem has disk...

Not really an option unless your tandem has disk brakes.
Forum: Tandem Cycling
09-30-20, 10:48 AM
Replies: 23
Views: 11,247
Posted By diabloridr

The EW WU111 on our Macchiatto (aluminum frame)...

The EW WU111 on our Macchiatto (aluminum frame) is installed in the stoker seat tube below the battery and has performed flawlessly. You may want to verify all drivers are up to date, as out of date...
Forum: Tandem Cycling
08-19-20, 08:39 AM
Replies: 28
Views: 3,367
Posted By diabloridr

The question marks surrounding this study are why...

The question marks surrounding this study are why I'd take an even-money bet that an ANSI committee is currently writing a standard for anti-viral face coverings.

Give it a year or two and all...
Forum: Tandem Cycling
08-17-20, 11:00 AM
Replies: 28
Views: 3,367
Posted By diabloridr

Or not: ...

Or not:

https://www.sfgate.com/shopping/article/neck-gaiters-arent-worse-than-no-mask-covid-15484868.php

The scientific method trudges along.
Forum: Tandem Cycling
08-17-20, 10:54 AM
Replies: 10
Views: 3,380
Posted By diabloridr

For installation on an older existing frame (like...

For installation on an older existing frame (like yours) I wouldn't even consider Di2 as a candidate due to the wire routing issues.

One vote for eTap.
Forum: Tandem Cycling
08-04-20, 09:09 AM
Replies: 40
Views: 7,389
Posted By diabloridr

Yes. Not completely fool proof, but very...

Yes.

Not completely fool proof, but very easy to use with less potential for error than manual methods.

The Park tool has two gauges: (1) worn, but has additional life, and (2) Replace now.
...
Forum: Tandem Cycling
06-15-20, 08:49 AM
Replies: 37
Views: 5,933
Posted By diabloridr

I think it depends on the individual. Like...

I think it depends on the individual.

Like you I move between 170's (fixed gear) to 172.5 (regular single) to 175's (tandem) without noticing a difference.

OTOH, stoker *must* have 165's on her...
Forum: Tandem Cycling
06-03-20, 08:47 AM
Replies: 37
Views: 5,933
Posted By diabloridr

Also consider going *slightly* out of phase,...

Also consider going *slightly* out of phase, perhaps only a chain link or two.

Beloved stoker and I have done so for decades and doing so assists in her being better able to "feel" the pedal...
Forum: Tandem Cycling
06-02-20, 10:33 AM
Replies: 29
Views: 4,358
Posted By diabloridr

Rolf Prima Vigor's? Those are intended for...

Rolf Prima Vigor's? Those are intended for single's only. Sure you don't mean Rolf Prima Tandem wheels?

The older versions were narrow, with a maximum recommended tire size of 25mm.

Newer...
Forum: Tandem Cycling
04-22-20, 08:52 AM
Replies: 17
Views: 3,408
Posted By diabloridr

I'm 6' and beloved stoker is 5'. Can't remember...

I'm 6' and beloved stoker is 5'. Can't remember exact leg lengths, but believe they fit within your 15% difference.

I use 175mm cranks on the tandem, and she has found she *must* have 165mm cranks...
Forum: Tandem Cycling
03-10-20, 10:07 AM
Replies: 15
Views: 3,418
Posted By diabloridr

15 miles and 30,000+ miles. We were (are?)...

15 miles and 30,000+ miles.

We were (are?) an aggressive team so lots of standing and sitting to load the post.
Forum: Tandem Cycling
03-09-20, 10:34 AM
Replies: 21
Views: 5,577
Posted By diabloridr

A hint: Don't forget to also update the firmware...

A hint: Don't forget to also update the firmware in the Shimano charger.

Our Macchiato experienced weird battery behavior last year. Updating the firmware on the bike brought no joy, but my LBS...
Forum: Tandem Cycling
03-02-20, 12:36 PM
Replies: 15
Views: 3,418
Posted By diabloridr

Broke at the frame interface when I sat my fat...

Broke at the frame interface when I sat my fat @$$ down on it. Bemused stoker ended up holding her handlebar attached to the failed post. We were just cruising along through a neighborhood and were...
Forum: Tandem Cycling
02-26-20, 04:55 PM
Replies: 15
Views: 3,418
Posted By diabloridr

Interestingly, I broke the aluminum captain's...

Interestingly, I broke the aluminum captain's seatpost on our old Speedster, likely through from high-cycle fatigue or corrosion-fatigue.

I'd worry more about component design than about the...
Forum: Tandem Cycling
02-24-20, 10:15 AM
Replies: 13
Views: 2,990
Posted By diabloridr

Although I doubt you budgeted for a...

Although I doubt you budgeted for a new/replacement vehicle as part of this project, there is a reason you see so many mini-vans at tandem rally's.

No other vehicle offers the ease of roll-in/roll...
Forum: Tandem Cycling
02-24-20, 10:10 AM
Replies: 34
Views: 9,798
Posted By diabloridr

Engineering 101: Light, Strong, Cheap. Pick any...

Engineering 101: Light, Strong, Cheap. Pick any two (or sometimes one...)

Rolf has been my preferred wheel for all our bikes since they were licensed to Bontrager.

Looking at wheels for single...
Forum: Tandem Cycling
02-24-20, 09:46 AM
Replies: 15
Views: 3,418
Posted By diabloridr

Then why does Co-Motion (to cite one example)...

Then why does Co-Motion (to cite one example) specify carbon fiber posts on many of their tandems?
Forum: Tandem Cycling
11-25-19, 03:39 PM
Replies: 15
Views: 5,558
Posted By diabloridr

My stoker is an experienced rider (30+ years on...

My stoker is an experienced rider (30+ years on her single, 25+ on our tandem). The couple of occasions she's tried a suspension seatpost during test rides, she's given them a big thumbs down as she...
Forum: Tandem Cycling
11-04-19, 10:03 AM
Replies: 10
Views: 2,372
Posted By diabloridr

A datapoint: Our EW-WU111 is mounted in the...

A datapoint: Our EW-WU111 is mounted in the stoker seatpost just below the battery and communicates fine with our Garmin 540.
Forum: Tandem Cycling
09-17-19, 12:16 PM
Replies: 26
Views: 6,396
Posted By diabloridr

A late datapoint: In our area one of the...

A late datapoint:

In our area one of the rider's was diagnosed with a heart condition and advised to maintain his heart rate below a certain threshold.

Not wanting to give up his friends or...
Forum: Tandem Cycling
09-17-19, 12:11 PM
Replies: 11
Views: 3,388
Posted By diabloridr

Just a couple of datapoints based on our two...

Just a couple of datapoints based on our two Co-Motions:

For years we rode a Speedster with dual-pivot rim brakes. We were satisfied, but there were a couple of occasions where I did not have the...
Forum: Tandem Cycling
09-17-19, 12:02 PM
Replies: 26
Views: 6,740
Posted By diabloridr

I would not clamp any bike by a frame tube,...

I would not clamp any bike by a frame tube, regardless of material. Even if one does not damage the tube, paint marring is possible.

Years ago, a well-meaning friend clamped my beloved stoker's...
Forum: Tandem Cycling
07-24-19, 08:21 AM
Replies: 42
Views: 12,498
Posted By diabloridr

Back in 2017 I posted about the process for...

Back in 2017 I posted about the process for replacing our 1999 Speedster.

See: https://www.bikeforums.net/tandem-cycling/1105986-new-tandem-report-2017-co-motion-macchiato-long-post.html

I...
Forum: Tandem Cycling
01-14-19, 11:43 AM
Replies: 18
Views: 5,017
Posted By diabloridr

We opted to use Lightning cranks when building up...

We opted to use Lightning cranks when building up our Co-Motion as 165mm stoker cranks are typically unicorns.

Pricey, but highly customizable.
Forum: Tandem Cycling
01-03-19, 06:05 PM
Replies: 40
Views: 5,893
Posted By diabloridr

Beloved stoker and I rode together for a number...

Beloved stoker and I rode together for a number of years before buying our first tandem. I've always been the stronger rider, but she drafted nicely on flat or rolling terrain. When climbing I'd pace...
Showing results 1 to 50 of 434
 
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