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Search: Posts Made By: diabloridr
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03-21-21, 09:58 AM
Replies: 7
Views: 897
Posted By diabloridr

Co-Motion makes a nicely designed stoker...

Co-Motion makes a nicely designed stoker handlebar bag, have you seen it?
03-15-21, 10:22 AM
Replies: 40
Views: 3,916
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,...
03-15-21, 10:13 AM
Replies: 40
Views: 3,916
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...
03-15-21, 10:06 AM
Replies: 17
Views: 1,450
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...
03-09-21, 10:37 AM
Replies: 40
Views: 3,916
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.
03-08-21, 02:08 PM
Replies: 40
Views: 3,916
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.
03-01-21, 11:29 AM
Replies: 22
Views: 2,452
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...
02-27-21, 05:34 PM
Replies: 6
Views: 745
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...
02-02-21, 08:37 AM
Replies: 8
Views: 873
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.
02-02-21, 08:35 AM
Replies: 14
Views: 1,342
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...
01-06-21, 09:56 AM
Replies: 9
Views: 1,167
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.
10-23-20, 08:34 AM
Replies: 7
Views: 1,277
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...
10-22-20, 10:14 AM
Replies: 10
Views: 1,398
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...
10-09-20, 09:03 AM
Replies: 19
Views: 1,826
Posted By diabloridr

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

Not really an option unless your tandem has disk brakes.
09-30-20, 10:48 AM
Replies: 17
Views: 3,499
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...
08-19-20, 08:39 AM
Replies: 28
Views: 2,624
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...
08-17-20, 11:00 AM
Replies: 28
Views: 2,624
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.
08-17-20, 10:54 AM
Replies: 10
Views: 2,125
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.
08-04-20, 09:09 AM
Replies: 40
Views: 5,701
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.
...
06-15-20, 08:49 AM
Replies: 37
Views: 3,781
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...
06-03-20, 08:47 AM
Replies: 37
Views: 3,781
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...
06-02-20, 10:33 AM
Replies: 29
Views: 3,540
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...
04-22-20, 08:52 AM
Replies: 17
Views: 2,339
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...
03-10-20, 10:07 AM
Replies: 15
Views: 2,142
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.
03-09-20, 10:34 AM
Replies: 21
Views: 3,444
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...
03-02-20, 12:36 PM
Replies: 15
Views: 2,142
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...
02-26-20, 04:55 PM
Replies: 15
Views: 2,142
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...
02-24-20, 10:15 AM
Replies: 13
Views: 1,994
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...
02-24-20, 10:10 AM
Replies: 34
Views: 6,790
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...
02-24-20, 09:46 AM
Replies: 15
Views: 2,142
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?
11-25-19, 03:39 PM
Replies: 15
Views: 3,642
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...
11-04-19, 10:03 AM
Replies: 10
Views: 2,000
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.
09-17-19, 12:16 PM
Replies: 26
Views: 4,824
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...
09-17-19, 12:11 PM
Replies: 11
Views: 2,517
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...
09-17-19, 12:02 PM
Replies: 26
Views: 4,967
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...
07-24-19, 08:21 AM
Replies: 42
Views: 9,180
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...
01-14-19, 11:43 AM
Replies: 9
Views: 1,971
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.
01-03-19, 06:05 PM
Replies: 40
Views: 4,763
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...
10-15-18, 09:32 AM
Replies: 28
Views: 6,198
Posted By diabloridr

Rather than track battery levels, I've made it a...

Rather than track battery levels, I've made it a habit to charge our 3 electric bikes (2 Di2 and 1 eTap) at the beginning of each month.

Probably overkill, but we haven't run out juice yet.
09-05-18, 12:42 PM
Replies: 47
Views: 9,635
Posted By diabloridr

Depends, they weigh a 1/2 pound more than your...

Depends, they weigh a 1/2 pound more than your existing wheels, while gaining the aero advantage of 4 fewer spokes and significantly taller rim height.

If you normally ride flat rides at 20+ MPH...
08-13-18, 08:47 AM
Replies: 98
Views: 14,925
Posted By diabloridr

If Calfee doesn't have a lug in the proper...

If Calfee doesn't have a lug in the proper dimensions (tube diameter & angles), they will hand-wrap the joint.

My stock Dragonfly has lugs at all three junctions.
Beloved stoker's custom 43cm...
08-13-18, 08:35 AM
Replies: 29
Views: 2,657
Posted By diabloridr

May not be helpful for avoiding a collision, but...

May not be helpful for avoiding a collision, but good chance it can record vehicle type, color, and license plate if one occurs.
08-09-18, 09:04 AM
Replies: 98
Views: 14,925
Posted By diabloridr

I've been watching this discussion from the...

I've been watching this discussion from the peanut gallery, but can offer my take from building a custom tandem and a pair of custom singles:

Our retired Co-Motion Speedster required custom...
07-24-18, 08:37 AM
Replies: 18
Views: 6,553
Posted By diabloridr

Why not just use the existing fork mount?

Why not just use the existing fork mount?
07-16-18, 09:12 AM
Replies: 47
Views: 9,635
Posted By diabloridr

Plus you don't even need to cleanly hop it, just...

Plus you don't even need to cleanly hop it, just so you reduce weighting on the wheels as you exit the pothole.
07-09-18, 10:44 AM
Replies: 47
Views: 9,635
Posted By diabloridr

Our observation was instability was only...

Our observation was instability was only initiated in crosswind conditions. The tall rim profile provide more area to interact with the crosswind.
07-09-18, 10:30 AM
Replies: 77
Views: 5,661
Posted By diabloridr

Beloved stoker only uses 165 cranks on all her...

Beloved stoker only uses 165 cranks on all her bikes.

When we were building up the Macchiatto last year we identified Middleburn & Lightning as readily available sources for our needs (We opted...
06-27-18, 11:25 AM
Replies: 71
Views: 8,197
Posted By diabloridr

I'm going to politely call BS on this, at least...

I'm going to politely call BS on this, at least in certain circumstances.

We've done rides where beloved stoker and I were on the Co-Motion riding with our friends on singles. All either race, or...
06-26-18, 02:34 PM
Replies: 26
Views: 2,730
Posted By diabloridr

SRAM doesn't offer a triple-compatible brifter. ...

SRAM doesn't offer a triple-compatible brifter.

The tolerance issues inherent in mechanical shifting systems (which are only worse on tandems) made the decision to go electronic on our new tandem...
06-11-18, 02:57 PM
Replies: 42
Views: 4,838
Posted By diabloridr

Depends on how you quantify "rough" Mavic...

Depends on how you quantify "rough"

Mavic used to offer a rim with a relatively rough ceramic coating on the braking track for improved performance, especially in wet conditions.
Unfortunately...
Showing results 1 to 50 of 422
 


 
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