Navet er hjulets hjerte - hvor hjulet fastgøres til cyklen og hvor du overfører power. Fra budget sealed bearings til high-end ceramic dream machines.

⭐ Hvorfor er det vigtigt?

  • Bærer hele din vægt og bike weight
  • Determines rolling resistance og efficiency
  • Freehub engagement speed påvirker responsiveness
  • Bearing quality påvirker smoothness og lifespan
  • Critical for wheel strength og durability
  • Påvirker maintenance frequency og cost

🔧 Vedligeholdelse

bearing service

frequency: Yearly eller hver 5.000 km for cartridge bearings
signs: Rough feeling, play/wiggle, grinding sound
diy: Kan skiftes derhjemme med proper tools (bearing press)
cost: 200-500 kr for bearing replacement + labor hvis professional

freehub service

frequency: Every 6 måneder hvis du rider meget, yearly minimum
what: Rens og re-lube pawls eller ratchet
signs: Slow engagement, skipping, ikke engaging
diy: Kan gøres derhjemme - YouTube guides available
critical: ISÆR vigtigt hvis du rider muddy/wet conditions

general

inspection: Tjek for play ved at rokke hjul side-to-side
cleaning: Rens hub shell ved wheel cleaning
lubrication: ALDRIG over-lube - excess lube attracts dirt

⚠️ Almindelige Fejl

Køber hubs uden at matche frame spacing

Konsekvens: Passer ikke i frame - 142mm vs 148mm boost

Løsning: Mål frame eller check specs før køb

Ignorerer bearing maintenance

Konsekvens: Bearings går i stykker, ødelægger hub shell

Løsning: Service bearings yearly - cheap prevention vs expensive repair

Over-tightener QR eller thru-axle

Konsekvens: Ødelagt threads eller binding bearings

Løsning: Snug men ikke gorilla-tight - følg manufacturer torque specs

Vælger for få eger (20h) som heavy rider

Konsekvens: Broke spokes, destroyed wheel

Løsning: 28h minimum for MTB, 32h hvis du er over 90kg eller rider rough

Glemmer at check freehub compatibility

Konsekvens: Kassette passer ikke på hub

Løsning: Shimano HG vs SRAM XD vs Campagnolo - tjek først

anatomy

hub shell:
description: Den ydre krop - hvor eger fastgøres
materials:
  • Aluminium (most common)
  • Carbon (exotic, dyrt)
  • Steel (vintage/budget)
spoke holes: 20, 24, 28, 32, eller 36 holes - flere = stærkere hjul
axle:
description: Aksen der går gennem navet - forbinder hjul til frame/fork
types:
  • Quick release (QR)
  • Thru-axle (12mm, 15mm, osv)
  • Bolt-on (old school)
bearings:
description: Tillader hjulet at dreje smoothly
types:
  • Loose ball (old)
  • Cartridge sealed (modern standard)
  • Ceramic (high-end)
freehub:
description: Rear hub only - hvor kassetten mounter, tillader coasting
pawls or ratchet: Engagement system - laver clicking sound
flanges:
description: De dele hvor egerne fastgøres
high flange: Stærkere hjul, stiffer laterally
low flange: Lettere, mere aero

front vs rear

front hub:
simpler: Bare hub shell, axle, bearings - ingen drivetrain
lighter: Ingen freehub mechanism
cheaper: Mindre kompleks
maintenance: Minimal - bare bearings
rear hub:
complex: Includes freehub body, pawls/ratchet, mere bearings
heavier: Freehub mechanism tilføjer vægt
expensive: Mere komponenter = højere pris
maintenance: Freehub skal services regelmæssigt

engagement systems

pawl system:
how it works: Spring-loaded pawls klikker ind i ratchet ring
engagement: Typisk 2-4 pawls = 24-72 punkter (degrees of engagement)
sound: Click-click-click når du coaster
pros:
  • Simpelt
  • Reliable
  • Nemt at service
  • Billigere
cons:
  • Slower engagement
  • Kan være mindre durable under heavy load
common: De fleste mid-tier hubs (Shimano, SRAM, DT Swiss)
ratchet system:
how it works: To ratchet rings med teeth der griber i hinanden
engagement: Typisk 18-54 teeth = meget hurtigere engagement
sound: Louder buzz sound
pros:
  • Hurtig engagement
  • Very durable
  • Simultaneous teeth contact = stærk
cons:
  • Dyrere
  • Lidt mere komplekst at service
common: DT Swiss star ratchet (legendary), Hope, Industry Nine
instant engagement:
what: High-end hubs med 100+ engagement punkter
examples: Industry Nine Hydra (690 punkter!), Chris King, Onyx
benefit: Næsten instant power transfer - vigtigt for teknisk riding
cost: 3.000-8.000+ kr per hub

bearing types

cartridge sealed:
description: Moderne standard - sealed bearings i cartridge
pros:
  • Low maintenance
  • Beskyttet mod elements
  • Længere lifespan
  • Smooth rolling
cons:
  • Skal skiftes helt når slidt
  • Kan ikke justeres
maintenance: Replace når de bliver rough - hver 5.000-15.000 km
cost: 50-200 kr per bearing replacement
ceramic bearings:
description: Keramiske balls i stedet for steel
pros:
  • Laveste rolling resistance
  • Holder længere
  • Mindre påvirket af corrosion
cons:
  • Meget dyrt (2-4x prisen)
  • Marginale gains for de fleste
cost: 500-1.500 kr per bearing set
worth it: Kun for racers eller hvis du har budget - minimal real-world difference
loose ball:
description: Old school - loose balls i cups med cone adjustment
pros:
  • Kan adjustes perfectly
  • Billigt at replace balls
cons:
  • Kræver frequent maintenance
  • Kan gå ud af adjustment
  • Ikke sealed
status: Stort set forældet - findes på vintage bikes

axle standards

quick release qr:
size: 9mm front, 10mm rear (standard)
mechanism: Cam lever - hurtig removal
pros:
  • Hurtig wheel removal
  • Universally compatible
  • Let
cons:
  • Mindre stiff
  • Kan løsne hvis ikke tight
  • Udphases på MTB
current use: Stadig standard på road bikes, phasing out på MTB
thru axle:
sizes: 12mm, 15mm (front), 12x142mm, 12x148mm (rear boost)
mechanism: Threads ind i frame/fork - meget stift
pros:
  • Meget stift
  • Bedre alignment
  • Sikkert
  • Bedre braking
cons:
  • Lidt langsommere wheel removal
  • Skal have matching frame
current use: Standard på moderne MTB og gravel, emerging på road
boost spacing:
what: Bredere hub spacing - 148mm rear (vs 142mm standard)
benefits: Bredere flange = stiffer hjul, bedre chainline, clearance til fat tires
compatibility: Kræver boost-compatible frame og fork
current use: Standard på moderne MTB

spoke hole count

20 24 holes:
use: Aero road wheels - weight savings
pros:
  • Lightest
  • Most aero
cons:
  • Mindre durable
  • Ikke til tunge riders eller rough terrain
best for: Road racing, smooth roads, light riders
28 holes:
use: Modern road og trail - balance
pros:
  • God balance af vægt og strength
cons:
  • Ikke optimal til very heavy loads
best for: Most riders - versatile
32 holes:
use: MTB, touring, gravel - strength priority
pros:
  • Very durable
  • Kan re-laces nemt
  • Handles rough terrain
cons:
  • Lidt tungere
best for: MTB, loaded touring, heavy riders, rough roads
36 holes:
use: Heavy duty - tandem, cargo, touring
pros:
  • Maksimal strength
cons:
  • Tungere
  • Overkill for de fleste
best for: Cargo bikes, tandems, extreme touring

hub width standards

road front: 100mm (QR) eller 12x100mm (thru-axle)
road rear: 130mm (QR older), 135mm (QR modern), eller 12x142mm (thru-axle)
mtb front: 15x100mm (old) eller 15x110mm (boost)
mtb rear: 12x142mm (standard) eller 12x148mm (boost)
note: SKAL matche frame og fork - tjek specs før køb

freehub standards

shimano hg: Standard Shimano cassettes (8/9/10/11-speed)
shimano microspline: Shimano 12-speed MTB
sram xd: SRAM cassettes med 10t smallest cog
campagnolo: Campagnolo cassettes only
note: Nogle hubs kan skifte freehub body - tjek compatibility

when to upgrade

current broken: Hvis bearings er shot og hub er low-quality, upgrade i stedet for repair
engagement: Hvis du vil have faster engagement til teknisk MTB riding
weight: Hvis du bygger light wheelset og hver gram tæller
durability: Hvis nuværende hubs ikke holder - upgrade til quality tier
conversion: Hvis du vil konvertere til thru-axle eller boost
note: Hubs holder i årevis - ikke typisk noget man upgrader uden grund

buying guide

budget replacement:
recommendation: Novatec, Formula, basic Shimano/SRAM
cost: 300-800 kr per hub
note: Fungerer fint - bare ikke fancy features eller lightest
best for: Budget builds, repairs, casual riding
mid range:
recommendation: Shimano 105/SLX, SRAM, DT Swiss 350
cost: 800-2.000 kr per hub
note: Excellent value - durable, serviceable, smooth
best for: Most riders - best bang-for-buck
high end:
recommendation: DT Swiss 240/350, Chris King, Hope, Industry Nine
cost: 2.000-5.000 kr per hub
note: Premium bearings, hurtig engagement, bombproof
best for: Enthusiasts, long-term investment, performance
exotic:
recommendation: Industry Nine Hydra, ceramic bearings, titanium parts
cost: 5.000-10.000+ kr per hub
note: Marginal gains, bragging rights, absolute lightest
best for: Racers, weight weenies, deep pockets

hub sound

why loud: Mere spring tension på pawls eller tighter ratchet = louder
brands:
silent: Onyx (sprag clutch - silent coasting), White Industries
medium: Shimano, SRAM
loud: DT Swiss, Chris King (angry bees), Industry Nine (LOUD)
very loud: Hope (distinct sound), I9 Hydra (sounds expensive)
preference: Purely personal - nogle elsker lyden, andre hader den
trail etiquette: Loud hub announcer dig til hikers/andre riders

pro tips

  • DT Swiss star ratchet system kan upgrades til flere teeth for faster engagement
  • Check bearing play every 1.000 km - early detection = cheap fix
  • Quality hubs holder 10+ år med proper maintenance - worth the investment
  • Louder hub = mere pawl spring tension = faster wear (trade-off)
  • Swap freehub bodies hvis du skifter mellem Shimano og SRAM - nogle hubs allow det

wheelbuilding considerations

spoke holes: Skal matche rim spoke count - 32h hub til 32h rim
flange spacing: Påvirker spoke tension og wheel stiffness
hub width: Bestemmer dish og spoke angles
quality: Hub er wheelsets critical component - don't cheap out

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