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REI Co-op Cycles CTY 1.1: specs, upgrades and what fits

The redesigned CTY 1.1 drops to a simpler 2x8 Shimano drivetrain, adds internal cable routing and room for 45 mm tires, and keeps the aluminum frame and fork with mechanical discs. Best for: Commuting, paved paths and light gravel.

Put this bike in your garageSee it in 3D

My take, from the specs

A dependable commuter and path bike, with room for 45mm tires, rack and fender mounts and Tektro mechanical discs on 160mm rotors. The 2x8 Shimano drivetrain with a 12-32 cassette is simple to maintain. At about 13.7 kg it is not light, the aluminum fork rides firm, and the mechanical discs need occasional pad adjustment.

Sizes: XS: 5′0″–5′3″ (152–160 cm) · S: 5′3″–5′6″ (160–168 cm) · M: 5′6″–5′9″ (168–175 cm) · L: 5′9″–6′0″ (175–183 cm) · XL: 6′0″–6′3″ (183–191 cm)

Stock specs

TypeHybrid
Year2026
Price when new$659
Sold atREI
Wheels700c × 40 mm tires
Gears2×8 · 46/30T · 12–32T
BrakesTektro MD-M280
ForkCo-op Cycles Aluminum fork, chromoly steerer
Rear derailleurShimano Altus RD-M310-L
ShifterShimano Altus Rapidfire Plus
CrankProwheel TB-CY01 alloy, 170mm
Bottom bracketNeco B910, 68 x 122.5mm
AxlesQuick release
Seatpost31.6 mm
Weight30.2 lb (13.7 kg)
SizesXS, S, M, L, XL
Stock colorsLunar Blue, Desert Sage

Upgrade limits

How far each part can go on this frame, and why. Measure your own bike to confirm the estimated ones.

PartLimitWhy
Widest tire (current wheel size)45 mmNo measurement yet. Estimate from owner reports and frame design. Your 19 mm internal rims suit roughly 28–49 mm tires.
Other wheel sizes650b up to ~52 mmDisc brakes don't care where the rim sits, so a 650b wheel with a fatter tire fits. A 650b × 47 is about the outer size of a 700 × 28, so the bottom bracket sits about 12 mm lower than on 700 × 40 (watch pedal strikes).
TubelessNot recommendedTubeless needs a rim built to seal (bead hook + channel) and tubeless-ready tires.
Valve typeUnknownDecides which tubes and pump heads fit. Presta tubes fit Schrader rims with a grommet; not the other way.
Replacement wheelsQuick release · 100/135 mm · 6-bolt discAny wheel matching axle type, spacing and brake mount fits. Rear also needs the right freehub.
Biggest rear cog34T (now 32T)Set by the rear derailleur (Shimano Altus RD-M310-L): max low sprocket 34T, total capacity 43T. A hanger extender can add a few teeth (hit-or-miss on non-Shadow derailleurs); a new derailleur is the reliable way to get more.
Front gears2x (46/30T) · needs 36T capacityA 2x drivetrain needs a front derailleur and left shifter. Your rear derailleur must take up (biggest − smallest ring) + (biggest − smallest cog) = 36T; yours handles 43T. Going 1x drops the front derailleur: simpler and quieter, with a slightly smaller range.
Chainring sizeUnknown (now 46T)Estimated from similar frames. Measure the chainring-to-chainstay gap to confirm. Check whether your ring is bolted or riveted. Spindle length (122.5 mm) sets chainline; a big change in ring size may need a different BB spindle.
Gear count upgrades8 → 9 or 10 speedShimano HG 8/9/10-speed freehub: takes 8, 9 or 10-speed cassettes, Shimano 11-speed MTB and CUES/LinkGlide cassettes (7-speed needs a 4.5 mm spacer; most 11/12-speed road cassettes need an 11-speed road freehub, though the 11-34 HG700/HG800 fit). Shifter,…
Cranks & bottom bracketSquare taper · 68 mm shell · 122.5 mm spindleAny square-taper crankset fits with the right spindle length. Upgrading to Hollowtech II needs a new BB (same threaded shell).
Pedal thread9/16" × 20Every adult multi-piece crank uses 9/16". One-piece kids/cruiser cranks use 1/2".
Brake padsTEKTRO E10Disc pads only fit calipers with the matching shape.
Rotor size160/160 mm now · front up to 180 mm6-bolt rotors. Going bigger needs a caliper adapter: post mount +20 mm adapter. Most steel forks allow 180 mm; check the fork if a max rotor is printed on it.
Caliper upgradesLong-pull (MTB) mechanicalYour levers pull a lot of cable, so upgrade calipers must be long-pull (MTB) versions: TRP Spyke, Juin Tech M1, Avid BB7 MTB. Road calipers (TRP Spyre, BB7 Road) would feel mushy.
Stems & bars1-1/8 steerer · 31.8 mm bar clampAny stem for a 1-1/8 steerer with a 31.8 mm clamp fits. You can cut a bar narrower but not wider.
Drop-bar conversionPossible with modsNeeds road brake/shift levers (microSHIFT R8 makes 8-speed ones that pull Shimano 8-speed cable correctly), a drop bar, tape, and road-pull brake calipers because road levers pull less cable. Usually $250+.
Seatposts31.6 mmBuy posts in exactly this diameter.
Racks, fenders, bottlesRack ✓ · Fender ✓ · 2 bottle · Fork cargo ✓Threaded eyelets at the dropouts and seat stays take a rack and fenders. Fork leg mounts take cargo cages.
Max load (rider + cargo)300 lbWheels are usually the weak point under heavy loads. Stay under this with rider plus luggage.

Best upgrades by area

Three options that fit the REI Co-op Cycles CTY 1.1 as-is in each area, from budget to best. ★ marks the one most worth the money. How we pick. Typical US prices, checked October 2026. They change often: check the price at the store.

AreaGoodBetterBest
TiresContinental Contact Urban 700x40 (40-622) wire (pair)
$$$ ★ Our pick
WTB Byway 700x40 (pair)
$$$
Schwalbe Marathon Almotion 700x38 (40-622) V-Guard Addix (pair)
$$$
Brake padsTektro E10.11 resin disc pads (2 sets)
$ ★ Our pick
Kool-Stop D620S sintered disc pads, Shimano B01S / Tektro E10.11 shape (2 pairs)
$$
SwissStop Disc 15 RS organic disc pads, Shimano B-type / Tektro E10.11 shape (2 pairs)
$$
Grips & tapeBudget ergonomic lock-on grips
$
Ergon GP1 ergonomic grips
$$ ★ Our pick
Ergon GP5 ergonomic grips with built-in bar ends (S or L)
$$$
SaddleWTB Volt saddle
$$
Fizik Terra Argo X5 saddle (150 or 160 mm)
$$$
Ergon SR Allroad Core Comp saddle (men's or women's)
$$$ ★ Our pick
PedalsRace Face Chester composite flat pedals
$$ ★ Our pick
Crankbrothers Stamp 2 aluminum flat pedals (small or large)
$$$
OneUp Components Aluminum flat pedals
$$$
ChainKMC Z8.3 6/7/8-speed chain (116 links)
$
KMC X8 8-speed chain with Missing Link
$
KMC X8 EPT 6/7/8-speed anti-rust chain with Missing Link
$$ ★ Our pick
CassetteShimano CS-HG31-8 cassette 11–34
$ ★ Our pick
SunRace CSM66 8-speed cassette 11–34 (nickel)
$$
Shimano Alivio CS-HG51-8 cassette 11–32
$$
BrakesShimano Tourney BR-TX805 mechanical disc calipers, long pull, post mount (pair)
$$ ★ Our pick
Juin Tech M1 cable-hydraulic calipers, long pull (pair)
$$$
—
RotorsShimano SM-RT56 160 mm 6-bolt rotor (1 rotor)
$ ★ Our pick
Galfer Wave 160 mm 6-bolt rotor, 1.8 mm (1 rotor)
$$
Shimano SM-RT86 Ice-Tech 160 mm 6-bolt rotor (1 rotor)
$$
SeatpostSR Suntour NCX suspension seatpost 31.6 x 350 mm
$$$ ★ Our pick
Redshift ShockStop Endurance suspension seatpost 31.6 mm
$$$$
Cirrus Kinekt 2.1 Aluminum suspension seatpost 31.6 mm (LR or XR spring)
$$$$
Bar & stem35° rise 60 mm stem
$ ★ Our pick
Redshift ShockStop suspension stem 31.8 (±6° or +30°)
$$$
Redshift ShockStop PRO suspension stem 31.8 (±6°)
$$$$
LightsPlanet Bike Beamer 200 + Blinky Squared USB light set
$$ ★ Our pick
Cygolite Metro Plus 800 + Hotshot Pro 150 USB light set
$$$
Trek (Bontrager) Ion Pro RT + Flare RT light set
$$$
Racks, bags & fendersTopeak Explorer rear rack (disc mount)
$$ ★ Our pick
Topeak Super Tourist DX Tubular rear rack (disc)
$$$
Tubus Disco steel rear rack for disc brakes (26" or 28"/700c)
$$$
WheelsWeinmann Zac19 700c 6-bolt disc rear wheel, QR 135, 36H, HG 8–10 speed
$$$ ★ Our pick
Shimano / DT Swiss R500 700c disc wheelset, QR 100/135, Center Lock, HG + 2 Shimano SM-RT54 160 mm Center Lock rotors
$$$$
HUNT 4 Season Gravel Disc X-Wide wheelset (QR 100/135, HG, Center Lock) + 2 Shimano SM-RT64 160 mm Center Lock rotors
$$$$

Upgrades that fit as-is

Tires

Tubes

Gearing

Brakes

Comfort

Control

Utility

Drivetrain

Wheels

Fits with small changes (38)

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Buying one used? Fair prices

Worked out from the price new ($659), age and condition, not live market data. If it needs tires, a chain or brakes, take off what fixing them would cost.

Condition1 year old3 years old5 years old
Like new$370–$490$300–$395$245–$320
Good$325–$430$265–$350$215–$285
Fair$270–$355$215–$285$175–$230
Needs work$205–$270$165–$220$135–$175

See what these really sold for on eBay · Other used bike prices

Geometry (size M)

Stack602°
Reach380 mm
Head angle71°
Seat angle74.5°
Chainstay445°
Wheelbase1065 mm
Seat tube450 mm

Compare with

Sources: REI: Co-op Cycles CTY 1.1 Bike (current, C08927) specs + size chart · REI: previous CTY 1.1 (197842, discontinued; weight + 300 lb limit) · Cyclists Hub: CTY bikes compared (2026 CTY 1.1 vs previous)