da Vinci Components

da Vinci Designs Direct Drive
American Made Billet Machined Cranks
(150mm to 200mm + 3 hole cranks) *** New Option – Cerakoted Black ***

daVinci Tandem Cranks

Click on the photo for a larger size

430 grams – Reduce rotating mass without any sacrifices

Impressively Stiff – All your energy goes into every pedal stroke

Replaceable / Interchangeable Spider – When the industry changes, or you change your chainring pattern, you don’t have to replace your cranks

Square Taper Interface – This old standard is still the best, most reliable, allows you to use different width bottom brackets to adjust chainline and you have many brands of serviceable bottom brackets to choose from.

Low Profile Bottom Bracket Spindle – Increases stiffness and reduces weight by using a shorter spindle.

No Creaking – Design eliminates the creaking associated with three piece cranks

Low 158mm Outside to Outside Q-Factor – Easier on your body

103mm spindle for road bikes
107mm spindle for mountain bikes
103 to 107mm spindle for tandem captain cranks (you can go wider if you like)
107 to 113mm spindle for tandem stoker cranks

Lengths Available– 150mm -160mm – 165mm – 167.5mm – 170mm – 172.5mm – 175mm – 180mm – 200mm – (130/150/170mm) or (120/140/160mm) Triple Hole Child/Full-size-person Cranks

Spiders Available
– Four Arm 104mm – 64mm
– Standard (or compact) 110mm
– Standard (or compact) 110mm – 74mm
– Special 110mm – 58mm  for those that want to run a chainring smaller than 24 tooth
– Road 130mm (with 74mm triple option)
– Road 130mm without 74mm triple option
-34 tooth Spider/Chainring. This is a replaceable one piece spider/34 tooth chainring. It is lighter, less expensive (no need to buy chainrings and chainring bolts) and perfectly concentric.

Retail Prices
Single Bike or Tandem Front –
$259 Any length*/Spider combination w/o triple hardware
For triple chainrings you will need inner chainrings bolts and spacers.
*200mm Single Bike or Tandem Front $289 – your choice of spider

Tandem Rear –
$299 Any length*/Spider combinations.

Add $40 pair for Black Cerakote

Complete Tandem Cranks – Front and rear cranks (any sizes we make),
34 tooth Crossover/Spiders
FSA ramped and pinned chainrings Available ring sets (30/39/53t), (22/32/44t), (36/53t). (34/50t)
$658* Add $30 for 200mm cranks

Replacement 34 tooth Spider/Chainring, or other spider  – These replacement spiders/chainring only fits da Vinci cranks. $49



Child Kit   $400.

Includes our three hole cranks from above (130/150/170mm or 120/140/160mm), sliding bottom bracket, spindle, your choice of spider, chain, and hardware. (This is all you need for a da Vinci tandem. A conventional tandem will require a second chainring, long chainrings bolts and spacers between the two left rear chainrings

Click on the thumbnail for full size photo
(pictured with old cranks, you would get the cranks above)

Tandem with child stoker kit

Tandem with child stoker kit

Bottom Bracket

$48 ChroMo Spindle – 215g
$129 Titanium Spindle – 160g

High quality JIS square taper bottom brackets with sealed bearings, and aluminum cups. Some sizes have an aluminum sleeve instead of the carbon fiber as shown.

Available in 103mm, 107mm, 110mm, 113mm, 118mm – For 68mm shell


Length Spindle – ChroMoly


Length Spindle – Titanium


davinci tandem brake booster

Stress Analysis Designed Brake Stiffener – Use Your Energy to Stop – Not to Flex Your Frame
Improves your braking
Reduced “mushy” feeling at your brake levers
Reduce brake squeal

  • We spent several tedious months on the design of these brake boosters. Trial and error with sophisticated stress analysis software — shaving a few grams here, adding a few grams there, until we came up with the ultimate design of stiffness and light weight.
  • Brake stud spacing range 70 to 92mm (2-3/4″ to 3-5/8″)
  • Big Stiffy (62 grams) for tires over 1.4″. The stiffest big tire brake booster we have experienced. It’s not the lightest, but are you looking for a piece of jewelry for your bike or something to improve your braking?
  • Small Stiffy (47 grams) for tires up to 1.4″. The Stiffest & Lightest brake booster around. If you are running skinny tires, there is no other choice.

Retail Price $32  *** We are out of the stand-off hardware, but still have the braces in the photo above. If you would like to use your own hardware, we are selling the braces for 50% ***


Size – Color

Easy-Split In-line cable Separators (aka Splitters, disconnects)
Quick – Simple – Light – Reliable – Easy Installation

Cable Separators / Disconnects / Splitters For Travel Bicycles

Standard Kit Includes: (2) Shift Cable Separators (1) Brake Cable Separator (1) 2mm Allen Wrench
Retail Price $44


Standard Easy-Split Kit

Shifter Kit Includes: (2) Shift Cable Separators (1) 2mm Allen Wrench
Retail Price $30


Shifter Kit

Brake Kit Includes: (1) Brake Cable Separators (1) 2mm Allen Wrench
Retail Price $16


Brake Kit

Easy-Splits also work for quick handlebar conversions.

If you have compatible road and mountain shifters and derailleurs, as well as compatible brakes. You could easily switch between road and mountain bars for different types of riding.

Bar Switch Shifter Kit Includes: (2) Shift Cable Separators (2) Extra male halves (1) 2mm Allen Wrench
Retail Price $45


Bar Switch Shifter Kit

Bar Switch Brake Kit Includes: (1) Brake Cable Separators (1) Extra male halve (1) 2mm Allen Wrench
Retail Price $24


Bar Switch Brake Kit

Easy-Split Replacement Hardware
It is a good idea to replace your set screws when you replace the cables, or with the 2nd time you replace the cables. Only use a good sharp 2mm Allen wrench (Hex key) to reduce your chances of rounding out the set screw.


EZ Split Replacement Set Screws


EZ Split Replacement O-Rings

Replacement / Spare 2mm Hex Key Wrench (Allen Wrench)

Pro Built Tandem Wheels 

* Rims are now all black Velocity Dyad

  • 26″ rims 36 spokes or 700c rims w/ 40 spokes.
  • Sapim Spokes. 13/15/14g (2.3/1.8/2.0mm)  for disc brake wheels
  • White Industries Hubs
  • Professionally hand built with Spoke Prep to reduce spoke loosening and pre-stressed (spokes are over-tensioned by hand to pre-stretch them). Also to reduce maintenance.
  • Available with black hubs and spokes

26″ Front Wheel $270

26″ Disc Front Wheel $300

26″ Rear Wheel Disc $510 (now with titanium Cassette Body)

* Add $25 per wheel for black hubs and spokes

700c Front Wheel $279

700c Disc Front Wheel $309

700c Rear Wheel Disc $519 (now with titanium Cassette Body)

* Add $25 per wheel for black hubs and spokes

And for the gram counters – 840 grams Front – 1060 grams Rear – Not bad for full blown tandem wheels, ready for years of trouble free service.
Add 58 grams per wheel for 700c

Control Tech Adjustable Stoker Stem $95

Seatpost clamping diameter 29.8mm or 31.6mm

27.2mm and 28.6mm shims for 29.8mm post are available.

Handlebar Diameter:

26mm (also works with 25.4mm) or 31.8mm (O.S.)


Long Boom (uncut range 200mm to 255mm)

Minimum stem length (after cutting) 155mm to 210mm

X-Long Boom (uncut 235mm to 320mm)

Click on the thumbnail for full size photo
daVinci Tandems Adjustable Stem


Seatpost Diameter
Handlebar Diameter

Shim to Fit Stoker Stem to Different Diameter Seatposts


Stoker stem to seatpost shim

Shim to Fit Different Diameter Handlebars


Handlebar Shim

Spare or Replacement Boom $45 – Extra Long $55



Fixed Length Titanium Stoker Stem
Shims to fit different diameter seatposts or handlebars above.


1/2 the weight of an adjustable stoker stem. 188g – $220 (Add $15 for Black)
Click to download full size pdf drawing for sizing. Please print full size.

Available in 160mm, 180mm, 200mm, 220mm Lengths
Fits 31.6mm Seatpost and 31.8mm OS handlebars.
Shims for 27.2mm or 29.8mm seatposts above.
Shims for 25.4/26mm  or 7/8″/22.2mm handlebars available above.


Titanium Stoker Stem

Maintenance Items
KMC 136 Link E11 11 speed chain (long enough for right rear drive chain and a big cassette
or 136 Link E10 10 speed chain


E10 or E11 Chain

9 Speed chain. KMC X9.93 in custom lengths w/Quick Link
If you have a custom Extra long rear top tube, order a “Drive Chain 124 Links” for the front timing chain and cut to fit.
If you have a 9 speed cassette, chainstays longer than 17″(43cm) or a rear cassette with a cog bigger than 36 tooth, please contact us for a drive chain longer than 124 links.



Replacement 34 tooth Spider/Chainring or other spiders- These replacement spiders, or spider/chainring only fits da Vinci cranks. $49



da Vinci Drive Chainrings
Replacement chainrings for the right side of the Intermediate Shaft


Chainrings for da Vinci Tandem

Replacement Intermediate Shaft Bearings (Need 2 per bike) 6903 2RS sealed cartridge bearings.


Quantity Each

NEW Custom Coupler Wrench
Custom Coupler Wrench
Fits S&S Couplers from 1-3/8 to 2″ diameter frame tubes.
With pedal wrench, box wrenches in 4mm, 5mm, 6mm, 1/4″, 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, & 15mm
Almost 2″ longer than the standard S&S wrench for more leverage.
Can be used with a 4mm Allen wrench to adjust your eccentrics.
Available in Stainless Steel now and Titanium coming soon. 



Finish Line Extreme Fluoro 20g Syringe – This is the Grease to use on your S&S Couplers

Out of stock

Double Freewheel Block (DFB) Tool $25

Lockring Wrench

Lockring Wrench

This wrench fits the intermediate shaft body lockring (the third bottom bracket that has the bearings in it) and the lockring that holds the chainrings on the spline drive, on tandems with three, two, or one chainrings.

Soon to be added: Freewheels

Solution Graphics

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