RideItAll
- Member since Mar 25, 2009 O+
- Male / 32
-
Yucaipa , California - 32 Followers
- 9 Trailforks Points
Mechanical engineer and avid cyclist
Recent
Selling
Apr 16, 2021 at 5:30
Apr 16, 2021
Cannondale F29 Hardtail, Large - Custom Do All Build
$1200 USDCustom build F29 set up for trail, gravel, bikepacking, etc.
- Fox Float 32 CTD Kashima, 120 mm travel
- Shimano XT/XTR/OneUp 1x10 wide range drivetrain; Praxis bottom bracket
- Shimano XT disk brake set; 180 mm / 160 mm RT86 Icetech rotors
- Thomson seatpost and stem (70 mm)
- DT Swiss Frequency Team wheelset
- Specialized Renegade 29 x 2.1 IN Gripton tires
Specialized Henge Saddle
Note: pedals and K-edge garmin mount not included.
RideItAll mikelevy's article
Jan 9, 2020 at 10:50
Jan 9, 2020
Video: Spot's Carbon Leaf Spring - The Explainer
Good job marketing team leaving axis labels off the Force/Stroke plot... looks like the rigid link system approximates the flexurized system within no more than 1-5%. Worth the added complexity?
Selling
Jun 19, 2019 at 14:35
Jun 19, 2019
KS LEV Dropper Post - 27.2 mm
$150 USDOne of the best dropper posts on the market. Bought this as an option for one of my bikes but did not end up using it. Clamp diameter is 27.2 mm (1.0625 IN).
Retail on this part is $400.
Selling
Jun 19, 2019 at 14:33
Jun 19, 2019
Rockshox Reverb Dropper Post - 31.6 x 380 mm
$75 USDHydraulically actuated dropper post. 31.6 mm clamp diameter.
Post is clean and well cared for. Needs a service performed. Entire service kit is included with purchase. Can perform the service for a nominal fee.
Retail on this part is ~$200.
Selling
Jun 19, 2019 at 8:03
Jun 19, 2019
Ohlins STX 22 for 2017-2019 Specialized Enduro
$100 USDOhlins STX 22 air shock with custom interface for Specialized Enduros, 2017-2019 model years.
An air sleeve service was just performed on this shock per the service schedule. Shock comes with a secondary seal head assembly buyer may use in future services. Next service should include a damper oil change.
Retail on this shock is $700.
Selling
Apr 10, 2019 at 18:32
Apr 10, 2019
Cannondale CAAD10 Black INC DI2
$800 USD2013 56cm Cannondale CAAD10 Black
Awesome and super lively bike. Ultegra DI2 works as good as new.
Has near new Specialized All-Condition 25c tires with ~300 miles on them.
Mechanic owned and ridden since new.
Market value ot $1200 - selling below to help this move!
Selling
Oct 12, 2018 at 12:26
Oct 12, 2018
Cannondale Scalpel Carbon 1
$1800 USDFor sale by original owner! A great cross-country bike looking for a new home.
This Scalpel is a nimble, snappy, capable, and reliable cross-country bike that would suit many owners. I am selling to make room after a move. As a former professional bicycle mechanic, I have ensured every degree of service has been performed beyond factory requirements.
Bolt-on upgrades include Shimano XT brakes, ODI handlebars, SRAM XX1 11sp drivetrain, and Mavic Crossmax XLR wheelset. Additionally, the rear shock has been re-valved by PUSH’d and offers even better performance for the user.
Not looking for trades. Can deliver withing greater LA area or ship - both options at purchaser’s cost.
Please reach out for any questions - THANKS!
RideItAll VorsprungSuspension's article
Dec 20, 2017 at 15:48
Dec 20, 2017
The Tuesday Tune Ep 23 - Frequency, Vibration Theory, and Harshness - Video
@VorsprungSuspension: Nice work! Matlab showing its versatility again.
I believe that you're overstating the problem. The models you've built are neither completely inaccurate nor of no use. You say you've learned a lot about the limitations of a human in the loop. I would call performance bounds valuable info! No?
Kudos on bringing an interesting subject to the masses in a relatable and accurate fashion. If you'd ever like to chat with someone flinging compliant mechanisms to other planetary bodies (different perspective than sounds like you've gathered from auto/moto) shoot me a PM.
RideItAll VorsprungSuspension's article
Dec 19, 2017 at 23:22
Dec 19, 2017
The Tuesday Tune Ep 23 - Frequency, Vibration Theory, and Harshness - Video
@vinay: close but not quite. Think about damping in terms of force. TLDR: LSC and HSC are not additive. Some more math...
-Consider Hooke’s Law
Force = stiffness * displacement (F=k*x).
-Consider Newton’s Third Law
Net Force = 0; without motion, every action must have an equal and opposite reaction (sum(F)=0)
- Damping force is a function of _velocity_
F_damp= c * v
Where c is your damping coefficient in terms of force per measure of speed and v is your velocity in measure of speed
- Combine...
F_input = k*x+c*v
This is a gross simplification. If you really want to understand the math behind LSC and HSC and how it affects your response curves you’ll need to build up your chops transforming to and from the frequency domain.
So stoked to see engineering math on Pinkbike!!!!!!
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