Trident Convertible – The Ultimate Adjustable Tandem & Triplet Bike
The Trident Convertible is the perfect blend of versatility and adjustability, designed with family-friendly PeriScope technology and S+S frame couplers for easy transport. Whether you're packing it into a vehicle or shipping it for travel, this convertible tandem/triplet bike offers seamless adaptability.
Unlike our Co-Pilot frame option, the Trident Convertible isn’t designed for airline-checkable luggage. However, its modular frame design lets you switch between a two-rider tandem or a three-rider triplet, making it an ideal choice for growing families or group adventures.
Key Features:
Optimized for 26” wheels with 30-40mm tires for a smooth ride
Co-Motion zonally-butted chromoly tubing for durability and performance
Oversized 44mm head tube & unicrown touring fork for enhanced stability
Proven Co-Motion touring geometry for confident, long-distance riding
Super-low standover clearance to accommodate smaller riders
Rack & fender mounts for ultimate touring convenience
Powerful dual disc brakes for superior stopping power
Shimano 105 drivetrain for reliable, smooth shifting
Hand-built touring wheels designed for strength and longevity
Whether you're cruising as a duo or riding as a trio, the Trident Convertible ensures a comfortable, stable, and adventure-ready ride for every journey.
Drivetrain: Co-Motion Compact tandem cranks 50/34t / 11-34t cassette
Cockpit:FSA Omega and Co-Motion stoker bars / FSA Gossamer and Co-Motion adj. stoker stems
Post/Saddle: Co-Motion 29.8mm, PeriScope Seatmast System / Selle Italia X1 & X3 Lady,
Wheels: Co-Motion A-20 tandem hubs / Velocity Dyad 26" rims
Tires: Schwalbe Spicer 26x1.5"
PeriScope Trident Geometry Table
Frame Size
A - Captain Top Tube (cm)
B - Captain Seat Tube (cm)
C -Stoker Seat Tube1(cm)
C2 -Stoker Seat Tube2(cm)
D - Head Tube (mm)
E - Chainstay (cm)
F - Seat Tube Angle
G - Fork Span (mm)
H - Head Tube Angle
I - Fork Rake (mm)
J - BB Drop (mm)
K - Capt. Standover (cm)
L -Stoker1 Standover (cm)
L2 -Stoker2 Standover (cm)
M - Wheelbase (cm)
N - Boom Tube 1,2 (cm)
O - Stack (mm)
P - Reach (mm)
Small
Large
52
57
32
32
27.5
27.5
27.5
27.5
165
165
43.8
43.8
74°
73°
375
375
71.5°
71.5°
45
45
55
55
56.5
56.5
49.5
49.5
49.5
49.5
239.9
244.8
70
70
554
554
359
389
Custom Paint Options
Opaque Paint Options Also known as non-metallic, or solid colors, Opaque finishes offer a strong rich color for a classic and traditional look.
A timeless paint option
for your Co-Motion.
Metallic Paint Options Tiny metallic or mica particles reflect light and add showroom depth and shine, making your Co-Motion frame stand out with a custom look.
Premium Paint Options Pearl and Candy finishes add showroom shine or understated elegance.Choose custom combinations to add a distinctive appearance for your Co-Motion.
Decal Choices Our available decal colors are shown above. These ink-only decals are sealed into your frame between
the applied color and the final clearcoat.
Two Color Fade Fade two colors from Top to Bottom or Front to Back for a unique finish. Choose any two colors from the same swatch of Opaque, Metallic or Pearlescent.
Panels Painted panels on the seat-tube and down-tube add a classic look to a bike. Choose any Opaque or Metallic paint for the panels and frame/fork color.
TEAM Logos Our TEAM Logo option is a custom reverse-masking process in which the logos are painted on the frame, as opposed to applied decals, for a bold, colorful appearance
Custom Colors Can't find the perfect color for your new steed? Don't worry, we can match almost any car color using our Sikkens automotive paint system. Give us a call to discuss options.
Silca Frame Pump The Impero Ultimate frame pump. This American-made pump fits perfectly under the top tube of your frame and delivers full volume and reliability.
Custom Name Decals Add custom text like a name, quote or phrase to your bike using Black or White paint. This is a custom reverse masking and will be protected by the clear coats on top.
Accessories & Options
Custom Sizing We have the experience, tools,
materials, and knowledge to create
the best fitting tandem for a
modest charge over the cost of
a standard sized tandem.
S+S Couplers (included) The PeriScope Trident Convedrtible inlcudes S+S couplers
for converting from a 3-seater triplet to 2-seater tandem. Includes
spanner wrench, cable splitters.
Polished Couplers This time intensive 3 stage
polishing process will bring your S&S
couplers to a beautiful and durable
shiny luster. Available for the Trident Convertible
Stainless Steel Dropouts Add elegance and durability to your frame with polished stainless steel dropouts. Never worry about paint chipping when installing and removing wheels.
Max Adjust Stoker Stem We make our Co-Motion Max
Adjust Stoker Stem to provide range
from shortest to longest extension
to maximize the fitting range of your tandem.
Kickstand Mount If you plan to mount a kickstand to your Co-Motion, this is the best way to do it. We have two options depending on the drivetrain you choose.
Crater Lake Badge Crater Lake N.P. antiqued silver head tube badge featuring Wizard Island. Crater Lake is a natural wonder, the deepest lake in the USA and one of the most pristine.
Lighthouse Badge Lighthouse antiqued silver badge for head tubes. Reminiscent of the Heceta Head Lighthouse on the Oregon coast just 70 miles from the Co-Motion factory.
Metal Head Tube Badge Classic Co-Motion logo metal
head tube badge. These can
be applied to both tapered and
straight head tubes. A great
classic look for your new bike.