Show us your bicycles!

[BinkieHuckerback]

In the UK it's Audi and BMW drivers one needs to fear.

 

[pseudoid]

There used to be arguments about the diameter of the ball-bearings [ahem: similar to .... ummmm.... say... 'bear spray'] m/c riders used to keep handy, in their left pockets.

 

[pseudoid]

Riders and drivers - of all sorts - feel that if a person likes the thrill-of-speed; then, they should take 'it' to the track.
Fine!
But a controlled environment - like a race track - does not have the exhilaration-of-the-unknown or that getting-away-with-it mentality...
IMHO: I've been there and done that - yawn!
I have 3 photos to post but I have no involvement.

Past, present, or future.

Rick "sticks mostly to dirt roads and trails, or back pavements that don't much go anywhere" Denney

... but @rdenney may.

 

[pseudoid]

Apology for late reply.

Can someone please provide the exact formula for showing the trace a wheel's valve-stem would make while traveling in a straight line?
Graphical representation (Height/Time plot) would also be much appreciated: I am brain-locked.

^^Needs qualification^^

The trajectory of a wheel's valve stem as the wheel moves in a straight line will essentially form a cycloid. A cycloid is the curve traced by a point on the rim of a circular wheel as the wheel rolls without slipping along a straight line.
The parametric equations for a cycloid are given by:
x=r(t−sin(t))
y=r(1−cos(t))
Here, r is the radius of the wheel, and t is the parameter, which can be thought of as time. As the wheel rolls without slipping, t also represents the angle through which the wheel has rotated.

- ChatGPT

From the perspective of a stationary viewer/VidCam, situated 3meters away from - 'wheel's valve-stem would make while traveling in a straight line' - from left to right.
Does the formula change? Like a 'parallax' effect of a moving object or like that of a 'doppler' effect?

 

[oldmanhifi]

My 1988 Marinoni Special

 

[somebodyelse]

From the perspective of a stationary viewer/VidCam, situated 3meters away from - 'wheel's valve-stem would make while traveling in a straight line' - from left to right.
Does the formula change? Like a 'parallax' effect of a moving object or like that of a 'doppler' effect?

The cycloid equation above would be 'spherical cow in a vacuum' level approximation. If you want to account for viewing angle it will change things, but then we should probably also have the depth of tire, rim and however much of the valve stem we're accounting for to find the point we're looking for. Do we need to consider the deformation of the tire under load too?

 

[pseudoid]

@somebodyelse, I was more simplistically having been trying to think the trace left behind by a light-source (e.g. LED) in the dark (attached to a solid wheel in forward steady motion).
Again from the vantage point 3meters away (or a variable for 'distance from object' although peak-amplitude and period will not change)

 

[cyclo]

My commuter bike... Four seasons commuting

Along a park... on the way home...

 

[cyclo]

I named my commuter The Nite Rider as I spent more time riding in the dark on it...

 

[pseudoid]

My commuter bike... Four seasons commuting

How many total miles do you put on your NightRider, during those four seasons?
I used to average about 1200miles/year but in the last 18 months, I have become just another slacker on an eBike!

 

[cyclo]

How many total miles do you put on your NightRider, during those four seasons?
I used average about 1200miles/year but in the last 18 months, I have become just another slacker on an eBike!

The past few years I have been averaging anywhere from 3500-5000 km per year on my bikes... 4-500 km per month from spring to fall, 250-300km per month during winter. During winter my mileage is limited by road conditions. I typically avoid riding a day or two after major snowfalls because of snow/ice accumulation on the roads. Niterider is the bike I use for commuting but I also have road bikes... I used to do group rides but now ride mostly solo.

Here is a video of a niterider commute...

Here is a typical group ride in the winter which I captured on video years ago:

 

[Ralph_Cramden]

Priority/Brilliant Cooper (via Costco Next). My priorities, after a sextuple bypass, are cardio exercise first (park rides), comfort for my 70 year old butt (note the gel saddle cover), and simplicity; three internal gears and Gates belt drive. Other than blowouts, I’m good for the next 20+ years.

 

[rdenney]

Riders and drivers - of all sorts - feel that if a person likes the thrill-of-speed; then, they should take 'it' to the track.
Fine!
But a controlled environment - like a race track - does not have the exhilaration-of-the-unknown or that getting-away-with-it mentality...
IMHO: I've been there and done that - yawn!
I have 3 photos to post but I have no involvement.
View attachment 301695
View attachment 301696
View attachment 301697
Past, present, or future.

... but @rdenney may.

Did I miss this one before?

I dunno. I feel like a velodrome presents the excitement of the unexpected more often than single-track on an MTB.

But for me, cycling is about being in a zone. I have no need for Adrenalin. Real life presents that often enough as it is, particularly when riding on public roads.

That’s also why I stopped racing cars. That, and I ran out of money.

Rick “cycling is—a little—cheaper” Denney

 

[Somafunk]

My mum needed a new bike so I bought her one of these, Specialized Turbo Vado SL E-bikes, its quite an upgrade over her 15yr old Carrera Subway/flat bar bike so she’s quite chuffed as it’s light for an E-bike at 14.5kg, still to get a set of panniers and a rack top bag and she’ll be all set to explore the roads and hills in Galloway, Scotland

 

[pseudoid]

My mum needed a new bike so I bought her one

What you did is so cool!
I peaked at the specs (thanx for posting a link) and it sounds like Specialized is making their own BottomBracket motor.
hmmmm... Not Bosch or the 'elepahant of the industry"

Motor

Specialized SL 1.1, custom lightweight motor

I am trying to convince myself into an electric BB conversion for a chopper bike that is just collecting dust.
Unfortunately, it would require sand-blast/paint first. I have already 'visualized' the ease with which the conversion can be done with the BB kits.

Specialized link seems to provide a wealth of specifications, but one of them confused me:

Battery

Specialized SL1-320, fully integrated, 320Wh

[?]
And few others seem to have been - intentionally - omitted:
What "Class" (max. speed rating) is this bike?
What is the range of the battery pack? "320Wh" does not sound to be a longer range than >25miles.

imo: Chix dig wicker-like baskets on their handlebars.

 

[Somafunk]

In uk so limited to 15.5mph with motor decoupling above that speed so no drag when pedalling.

I understand the motor is a collaboration with Brose (electric motor specialists) and the range should be good enough for 40+ miles range with mixed power use which is decent with the internal battery or could be doubled with additional water bottle battery.

 

[pseudoid]

Hey, wait a second, what exactly is going on here?

link

 

[somebodyelse]

Hey, wait a second, what exactly is going on here?

Sensible engineering - better power output and efficiency than the old arm-powered winch grinding stations.

 

[pseudoid]

Sensible engineering - better power output and efficiency than the old arm-powered winch grinding stations.

I am big fan and have been watching every/any sailing event that has ever been aired anywhere!
It was a shocker to see those bicyclists back in 2017 America'sCup, and was used as a secret weapon no other team knew about.
Sailing regattas and cups have always had some really weird "surprises" over the decades, including scuba-geared spying to determine the 'under water" design secrets of the competition, etc.
A few decades ago [and as I recall], American team in San Diego America's Cup came with a catamaran to the series, as it turned out that none of the regulations specially banned cats from racing in the Cup.
Hilarity ensued. Like bringing a bazooka to a boxing match!

Originally I did not want to include the explanation below the posted image, but I did not want to have to explain in words....

 

[KSTR]

Another Specialized SL for this thread, my Turbo Como SL 5.0 (someone's youtube review link). Sort of a precision, zero maintenance, all-weather, everyday commuter/cruiser with optional assist (optional as it runs perfectly fine without). It not easy to judge from the pic but man, this bike is huge but still moderate weight thanks to the small battery and motor. I also have matching color hard-case panniers by Fjallraven (https://www.fjallraven.com/eu/en-gb/bags-gear/fjallraven-specialized/sf-cool-cave) because the original front-mount basket is a useless gimmick plus it completely spoils the elegant outline of the bike.