Cranks | Kid Cranks | Bottom Bracket | Rims | Brake Boosters | Cable Separator | Wheels | Stoker Stem | Derailleur | Maintenance Items |

Solution Graphics

da Vinci Designs Direct Drive

American Made Billet Machined Cranks

(150mm to 200mm + 3 hole cranks)

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

Single Radius Crank Profile – Allows chainring, front deraileur, chainstay, and ankle clearance while increasing strength and stiffness

Tapered Crank Arms – Put the strength where it is needed and reduces weight

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

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

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

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

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 110mm – 74mm

-Road 130mm (with 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 –

$220 Any length*/Spider combination w/o triple hardware

For triple chainrings you will need inner chainrings bolts and spacers. Price varies

*200mm Single Bike or Tandem Front $250 – your choice of spider

Tandem Rear –

$260 Any length*/Spider combinations.

Complete Tandem Cranks – Front and rear cranks (any sizes we make),

34 tooth Crossover/Spiders

FSA ramped and pinned chainrings, your choice (54, 53, 52t Outer), (42, 39t Middle), (32, 30t Inner)

$550* Add $30 for 200mm cranks

Replacement 34 tooth Spider/Chainring – This replacement chainring only fits da Vinci cranks. $38.50

Little Stoker Kid Cranks *** Out of Stock for undetermined length of time.


We bought and re-machined Shimano Deore XT Cranks for use with a sliding bottom bracket for your child stoker.

  • Drilled for both 125mm and 145mm crank lengths
  • CNC Machined shorter
  • Back side is machined for less weight
  • An affordable, more elegant alternative to crank arm shorteners
  • Left arm has a 110/74mm chainring bolt pattern. Right arm has no spider.

Child Kit *** We have kid kits available with the three hole cranks for $380.

Kit Price $245

Includes Little Stoker Cranks, sliding bottom bracket, spindle, 34t or 38t chainring, 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


Bottom Bracket

$42 ChroMo Spindle – 215g
$117 Titanium Spindle – 160g

High quality JIS square taper bottom brackets with sealed bearings, carbon fiber body, and aluminum cups

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

daVinci Tandem Bottom Bracket

Click on the thumbnail for full size photo

Length Spindle – ChroMoly

Length Spindle – Titanium

da Vinci V-23 Rim

daVinci Tandem Rims

  • Tandem Duty Rim
  • 2.7mm Thick Spoke Bed for Strength and Longevity
  • 6061 T6 Aluminum Alloy
  • 22.9mm Wide – 24mm Tall
  • Available in:  26″ 36 hole and 700c 40 hole
  • 26″ ERD 532mm – 520 grams
  • 700c ERD 594mm – 570 grams
  • Retail Price $50


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
Now available in Black

  • 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 $28


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 $32

Standard Easy-Split Kit
** Out of silver – Order black only **

Shifter Kit Includes: (2) Shift Cable Separators (1) 2mm Allen Wrench
Retail Price $23

Shifter Kit
** Out of silver – Order black only **

Brake Kit Includes: (1) Brake Cable Separators (1) 2mm Allen Wrench
Retail Price $13

Brake Kit
** Out of silver – Order black only **

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 $34

Bar Switch Shifter Kit

Bar Switch Brake Kit Includes: (1) Brake Cable Separators (1) Extra male halve (1) 2mm Allen Wrench
Retail Price $18

Bar Switch Brake Kit

Pro Built Tandem Wheels 

* Rims are now black with machined sidewalls.

  • 26″ V-23 rims 36 spokes (more than enough for these rims) or 700c V-23 rims w/ 40 spokes.
  • Sapim Spokes. 14/15g (2.0/1.8mm) or 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 $225

26″ Disc Front Wheel $255

26″ Rear Wheel Disc or Drum $470 (now with titanium Cassette Body)

* Add $20 per wheel for black hubs and spokes

700c Front Wheel $230

700c Disc Front Wheel $260

700c Rear Wheel Disc or Drum $475 (now with titanium Cassette Body)

* Add $20 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 $7

Use with stoker stem for 29.8mm seatpost.

Size Seatpost

Spare or Replacement Boom $45 – Extra Long $55

25.4 / 26mm X-Long boom

Handlebar Diameter

Fixed Length Titanium Stoker Stem  – New length and Black option (photo coming soon)


1/2 the weight of an adjustable stoker stem. 188g – $220 (Add $15 for Black)

Available in 160mm, 180mm, 200mm, NEW 220mm Lengths
Available for 31.6mm Seatpost and 31.8mm OS handlebars. Shims for 25.4 or 26mm bars also available. $8

Length  – Natural Finish

NEW! Black Powdercoated Titanium Stoker Stem Add $15

Length – Black

Shim to use 25.4 or 26mm bars $8

Custom Rear Derailleur

Mix different Shifters with Shimano/SRAM 9 or 10 Speed Cassettes.

Click on the thumbnail for full size photos

daVinci Tandem Rear Derailleur

When is the best not good enough?

Even though we offer a wider range of gears than any other bicycle in the industry, we occasionally have a need for gearing a little lower. The Campagnolo rear derailleurs we have been using for years do not work well with rear cogs larger than 29 tooth. We do not want to give up the reliability, rebuildabilty, comfort and front derailleur trim that only Campy Ergo shifters offer, but ten speed chains are proving to be too finicky and not very durable. Keeping to our Credo of “Drawing outside the chalkboard” we modified SRAM X9 Long cage and Medium cage derailleurs to work with Campy shifters. Now you can use any Campagnolo ten speed Ergo shifter and SRAM or Shimano compatible 9 speed cassette together. The CNC machined aluminum cable guide replaces the plastic one on the back of every X9 or X7 derailleur.

Available models:
C0-9 Campagnolo 10 Speed Shifters and Shimano/SRAM 9 speed Cassette.
S0-9 Shimano 10 Speed Shifter and Shimano/SRAM 9 speed Cassette.
Long Cage – Max rear cog 34 tooth – Chain wrap 45 tooth

Shifter & Cassette

Maintenance Items

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.


Replacement 34 tooth Spider/Chainring – This replacement chainring only fits da Vinci cranks. $38.50

Soon to be added 12/18/24/30 or 14/21/28 chainrings with or without spacers.
DFB Tool Long or Short
S&S Double Spanner Pedal Wrench