Frame - C° - Core Carbon | Frame fit - Endurance | Tyre clearance - 45mm | Real Weight Including All Parts - Approx 1.55kg
IKUISTA Fit Recommendation
Bike:
—
· —
Important:
This tool provides a guideline recommendation based on the measurements you enter.
We cannot guarantee the recommendation is perfect —
flexibility, riding style, saddle setup, and personal preference matter.
Your final configuration and component choices
(size, stem, bar, cranks, spacers) are always your responsibility.
How to measure:
Stand barefoot against a wall. Look forward. Measure to the top of your head.
How to measure:
Barefoot. Place a book firmly into your crotch (like a saddle)
and measure from floor to the top edge. Most people are 65–95 cm —
if yours is far from this, check you measured in cm, not inches.
How to measure:
Measure bone-to-bone across shoulders
(acromion to acromion), not shirt seam to seam.
Bar width is measured center-to-center (c-c).
Riding positioni
What this affects:
This slider affects frame size, stem and spacers.
In a size-overlap zone a more comfortable position picks
a bigger frame + shorter stem (higher front end);
an aggressive position picks a smaller frame + longer stem
(lower front end).
Endurance
ComfortEnduranceRace
i
What this affects:
With clip-on aero bars your forearms rest on pads and your grip moves forward.
We then recommend a shorter stem and, between two sizes, the bigger frame —
a higher and more stable front end is easier to hold in the aero position.
The saddle often moves slightly forward and up in aero use.
Extra measurement (optional)
How to measure:
Measure suprasternal notch (base of throat) → crotch
(same point as inseam). Tape runs along the front of your body.
This refines frame size and cockpit/stem.
Most people are 45–65 cm — if yours is far from this,
check you measured in cm, not inches.
How to test:
Stand with straight legs and reach toward your toes.
Can't get near = stiff.
Reach your toes = average.
Palms flat on the floor = supple.
This tells us how low a riding position you can hold comfortably.
Your recommendation
Recommended size:
—
This is the bike frame size. Choose this when you order.
Saddle height:
—
Set your saddle to this height.
Measure from the top of the saddle down to the pedal,
with the pedal at its lowest point. Fine-tune to comfort.
Handlebar width:
—
Order a handlebar of this width.
Stem:
—
The short part that connects the handlebar to the frame.
Order this length.
Spacers:
—
Small rings under the stem that set the handlebar height.
Start with this amount.
Configurator link missing:
add configurator_url to the bike_model entry.
Tip: take a screenshot before going to the configurator.
Expected availability–
Missing components
Pay in parts – up to 36 months at 0% interest with Zaver financing.
Show financing calculation
With 36-month term–/mo
12 mo24 mo36 mo
Estimated monthly payment–
Estimated total cost–
Product price–
Setup fee–
Monthly fee–/mo
Interest estimate–
This calculation is an estimate. Currency conversion is indicative. Final monthly payment and terms are shown at checkout before confirmation.
Read financing terms.
Choose your preferred shipping partner at checkout. IKUISTA offers flexible delivery options through Vapaus and GoByBike, both trusted carriers. Select the option that works best for your location and timeline. Each carrier provides reliable tracking and professional handling of your bike or components, ensuring your order arrives in perfect condition.
If your bike doesn’t feel right within 30 days of delivery, we’ll help you dial it in. How the Fit Guarantee works
Ride with confidence. If your frame is damaged, we’ll replace it up to 20% of the frame price. How it works
Purchase Here - Add resale value and peace of mind. The frame warranty transfers to the next owner. How it works
Trade your Ikuista back toward a new one, at a value we set by inspection. We take back any Ikuista, whatever its age. How it works
Every bike is assembled to order in and individually quality-checked before leaving our facility. Estimated dispatch time is approximately 2 weeks from the date of purchase.
Hand over the whole bike at the end of its life. No dismantling, no sorting. Our partner Kuusakoski recycles it all, metal and carbon alike, back into raw material. Read more
Seatpost: IKUISTA Spektri C° Aero Carbon, 0 mm offset, included
Seatpost clamp and frame accessories: included
Maximum tyre clearance: 45 mm
Bottom bracket interface: threaded
Frameset only. Wheels, tyres, drivetrain, brakes, saddle and cockpit are not included. Check component compatibility before building.
Geometry chart
Bike Geometry & Sizes
Measurement
S
M
L
XL
XXL
A — Seat tube length
470 mm
495 mm
520 mm
545 mm
570 mm
B — Seat tube angle
74°
73.5°
73.5°
73.5°
73.5°
C — Head tube length
110 mm
125 mm
145 mm
165 mm
185 mm
D — Head tube angle
70.5°
71°
71.5°
71.5°
71.5°
E — Top tube length
521 mm
539 mm
553 mm
568 mm
583 mm
G — B.B. drop
78 mm
78 mm
78 mm
78 mm
78 mm
H — Chainstay length
435 mm
435 mm
435 mm
435 mm
435 mm
I — Fork offset
50 mm
50 mm
50 mm
50 mm
50 mm
J — Wheelbase
1011 mm
1020 mm
1030 mm
1046 mm
1061 mm
K — Reach
365 mm
373 mm
381 mm
390 mm
399 mm
L — Stack
542 mm
558 mm
579 mm
598 mm
617 mm
Inseam
75–80 cm
78–85 cm
82–88 cm
86–92 cm
89–95 cm
Rider height
163–173 cm
170–180 cm
178–187 cm
185–195 cm
190–200 cm
Components geometry
Component Geometry
Measurement
S
M
L
XL
XXL
Spacers (mm)
30mm
30mm
30mm
30mm
30mm
Stem length (mm)
80mm
90mm
100mm
110mm
110mm
Handlebar width (mm)
400mm
420mm
420mm
440mm
440mm
Crank length (mm)
165mm
170mm
170mm
172.5mm
172.5mm
Front chainring
–
–
–
–
–
Saddle height min (mm)
650mm
680mm
725mm
765mm
800mm
Saddle height max (mm)
705mm
755mm
790mm
830mm
865mm
Seatpost length (mm)
350mm
350mm
400mm
400mm
400mm
Product manuals
Note: Some ad blockers, privacy extensions, antivirus software, corporate networks, or browser security settings may prevent documents from opening. If a file does not load, try another browser or temporarily disable blocking extensions.
I have to say, compared to my own old beater bike, this is a completely different ride.
— AamulehtiTomi Pyy, journalist, Aamulehti, First ride impression, July 2026
Spektri C° Frameset
Spektri is IKUISTA’s endurance and all-road platform, designed for riders who do not plan their routes around perfect asphalt. The C° – Core carbon monocoque frame combines efficient power transfer with balanced endurance geometry and a more relaxed riding position for long-distance riding.
With up to 45 mm tyre clearance, Spektri supports compatible road and wider all-road tyre choices for smooth tarmac, broken pavement and light gravel. Internal routing, a threaded bottom bracket and a UDH hanger provide the foundation for your own build. The included IKUISTA Spektri C° aero carbon seatpost has 0 mm offset.
The frameset includes the frame, fork, front and rear axles, headset bearings, UDH hanger, seatpost, seatpost clamp and frame accessories. Wheels, tyres, drivetrain, brakes, saddle and cockpit are not included. Choose S, M, L, XL or XXL in Oxide Red or Stone Taupe. Check geometry and component compatibility before choosing your build.
Spektri C° Frameset is IKUISTA's endurance and all-road platform for long days in the saddle, rough asphalt and light gravel. Build it with your own drivetrain, wheels and cockpit for your all-road bike.
The Spektri C° Core carbon frame combines efficient power transfer with a more upright, relaxed endurance geometry and room for up to 45 mm tyres. The included flat-mount carbon fork with internal routing and 12×100 mm thru-axle, and the aero carbon seatpost, are matched to the frame.
Includes the Spektri C° carbon frame and fork, Spektri aero carbon seatpost (0 mm offset) with clamp, front and rear axles, headset bearings, UDH hanger and frame accessories. Up to 45 mm tyres, threaded bottom bracket, internal routing. Sizes S–XXL. Wheels, tyres, drivetrain, brakes, saddle and cockpit are not included.
