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