Project Fence

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· Listing quality: Entry Mid Enth. Prem. Pro

De-mystify what fits your bike. Find compatible parts on eBay.

Assistant Note Project Fence is an aid designed to help navigate compatibility. It is not a babysitter. You are solely responsible for ensuring that a part fits your bike and verifying its condition before purchase. Always review listings carefully.
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See what the best available upgrade is across every part category for your discipline. Claude picks the ideal spec, then finds the best current eBay listing for each.

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Cassette
SRAM XX SL Eagle T-Type XS-1299 10-52T 12-speed
Pro ~£499 new
The lightest, widest-range 12-speed cassette available makes it the definitive gravel choice for mixed terrain from fast tarmac to steep climbs.
Fits a Shimano Micro Spline or SRAM XD freehub (both common on gravel wheelsets); 12-speed spacing is the current standard for gravel groupsets.
Runner-up: Shimano GRX RX-CS-M9100 10-45T 12-speed
eBay?
Chain
SRAM XX SL Eagle T-Type Flattop 12-speed
Pro ~£69 new
The lightest 12-speed chain on the market with a hollow-pin construction, optimised for T-Type drivetrain precision and longevity on gravel.
12-speed Flattop chain is required for SRAM T-Type drivetrains; also cross-compatible with any 12-speed cassette.
Runner-up: Shimano XTR CN-M9100 12-speed
eBay?
Tyres
Vittoria Terreno Dry 700x40c TLR G2.0 Graphene
Pro ~£62 new
Fast-rolling centre tread with aggressive side knobs gives the perfect mixed-surface gravel balance between speed and grip.
700c wheel size is the gravel standard; 40mm width fits within typical gravel frame/fork clearances of 40–47mm; tubeless-ready bead seats any UST or TLR rim.
Runner-up: Panaracer GravelKing SK+ 700x40c TLR
eBay?
Wheelset
Enve AG25 700c Wheelset (Centre Lock, 12x100/12x142mm)
Pro ~£2799 new
Enve's dedicated gravel carbon wheelset with a 25mm internal width is engineered specifically for high-volume gravel tyres, offering unmatched stiffness-to-weight on mixed terrain.
12x100mm front / 12x142mm rear thru-axle is the gravel standard; Centre Lock disc interface; 700c; XDR or Micro Spline freehub available on order.
Runner-up: Zipp 101 XPLR Carbon 700c Wheelset
eBay?
Brakes
SRAM Red AXS HRD Flat Mount Hydraulic Disc Brake Set
Pro ~£699 new
SRAM Red AXS HRD delivers the most powerful, modular wireless-compatible hydraulic braking in the gravel category with exceptional lever feel.
Flat Mount caliper standard is universal on modern gravel frames; compatible with 160mm or 140mm rotors via adapter; fits 12x100/12x142 axle standards.
Runner-up: Shimano GRX RX820 Di2 Flat Mount Hydraulic
eBay?
Chainset
SRAM Red XPLR AXS Wide Power Meter Chainset 40T 170mm (DUB)
Pro ~£999 new
A single-ring gravel-specific chainset with integrated dual-sided power meter, purpose-built for the wide-range XPLR cassette and uneven terrain.
DUB bottom bracket spindle fits most modern threaded (BSA 68/73mm) or T47 gravel frame BB shells via appropriate SRAM DUB adapter; 1x40T pairs with 10-52T cassette.
Runner-up: Shimano GRX RX820 Power Meter Chainset 40T 172.5mm
eBay?
Rear derailleur
SRAM Red XPLR AXS Rear Derailleur (Long Cage, 10-52T)
Pro ~£549 new
Wireless SRAM Red XPLR AXS is the pinnacle gravel rear derailleur, with a gravel-specific long cage tuned for 10-52T range and a clutch for chain security on rough terrain.
Designed exclusively for SRAM XPLR 12-speed 1x gravel drivetrains; standard direct-mount hanger fitting found on all modern gravel frames.
Runner-up: Shimano GRX RX822 Di2 Rear Derailleur 12-speed
eBay?
Handlebars
Enve G Series Gravel Bar 44cm (31.8mm clamp)
Pro ~£319 new
Enve's G Series bar features a pronounced flare (16° per side) and an ergonomic drop that provides maximum control and comfort over long gravel days.
31.8mm clamp diameter is the universal standard for gravel stems; 44cm width is the most versatile gravel sizing; carbon layup meets standard stem clamp torque specs.
Runner-up: Zipp SL-70 XPLR Carbon Gravel Bar 44cm
eBay?
Seatpost
Specialized S-Works FACT Carbon Dropper Post 27.2mm x 380mm
Pro ~£449 new
A lightweight carbon dropper post brings full trail-worthy saddle control to gravel riding, transforming technical descents without adding meaningful weight.
27.2mm is the most common gravel frame seatpost diameter; 380mm insertion length fits a wide range of frame sizes; standard 2-bolt saddle clamp is universal.
Runner-up: PNW Components Bachelor Infinite Dropper Post 27.2mm
eBay?