Bulls Trail Grinder Gravel Bike 28" gold

zweirad-stadler:bulls-trail-grinder-gravel-bike-28-gold · source URL · confidence 0.83

Eligibility

Can win a band.

Size decisions

retailer label	alpha	comparable cm	match	mapping	in stock	variant price	evidence
S = 45 cm	S	—	unknown	unsupported — the listing's 45 cm is a frame measurement	yes	listing price	—
L = 51 cm	L	—	unknown	unsupported — the listing's 51 cm is a frame measurement	yes	listing price	—

retailer label

alpha

comparable cm

match

mapping

in stock

variant price

evidence

S = 45 cm

—

unknown

unsupported — the listing's 45 cm is a frame measurement

yes

listing price

—

L = 51 cm

—

unknown

unsupported — the listing's 51 cm is a frame measurement

yes

listing price

—

mapping	unsupported
discarded figure	the listing prints 45 cm beside its letter size
reason	The centimetre figures retailers print for Bulls do not behave like size names (inconsistent), so they are read as frame measurements. See size-map.json.

mapping

unsupported

discarded figure

the listing prints 45 cm beside its letter size

reason

The centimetre figures retailers print for Bulls do not behave like size names (inconsistent), so they are read as frame measurements. See size-map.json.

A shopper asking for: 54 → nothing compatible · 56 → nothing compatible · 58 → nothing compatible · 60 → nothing compatible

Identity

Canonical configuration: Bulls | Trail Grinder Gravel Bike 28" | GRX
Confidence: medium

brand exact (Bulls)
model normalized to "trail grinder gravel 28"
groupset family exact (GRX)
model year unavailable on every listing
2 listings across 1 retailer
downgraded to medium: listings disagree on speeds: 12 vs 11; suspension: front vs none
conflict: speeds: 12 vs 11
conflict: suspension: front vs none

retailer	price	sizes in stock
Zweirad Stadler	€1.688	61 cm	debug
Zweirad Stadler	€1.699	S = 45 cm, L = 51 cm	debug

retailer

price

sizes in stock

Zweirad Stadler

€1.688

61 cm

debug

Zweirad Stadler

€1.699

S = 45 cm, L = 51 cm

debug

Provenance — why we believe each fact

field source evidence

brand retailer:zweirad-stadler / parse Bulls

model retailer:zweirad-stadler / derived Bulls Trail Grinder Gravel Bike 28" gold

category retailer:zweirad-stadler / parse Grinder

frameMaterial retailer:zweirad-stadler / parse Aluminium

groupsetFamily retailer:zweirad-stadler / dictionary Shimano GRX || Shimano GRX

electronicShifting retailer:zweirad-stadler / derived Shimano GRX || Shimano GRX

speeds retailer:zweirad-stadler / parse 12-Gang

brakes retailer:zweirad-stadler / parse Hydraulische Scheibenbremsen

suspension retailer:zweirad-stadler / derived suspension fork "SR Suntour GVX32" and no rear shock in a 28-field spec table

fork retailer:zweirad-stadler / parse SR Suntour GVX32

dropperPost retailer:zweirad-stadler / derived seatpost row "Bulls Aluminium, 27,2 mm" names no dropper, in a 28-field spec table

beltDrive retailer:zweirad-stadler / parse Kettenschaltung

lighting retailer:zweirad-stadler / parse MonkeyLink Recharge (Beleuchtung nicht im Lieferumfang enthalten)

wheelSize retailer:zweirad-stadler / parse 28

powerMeter retailer:zweirad-stadler / derived absent from a 28-field spec table

availability retailer:zweirad-stadler / derived 2 of 2 sizes orderable

field	source	evidence
brand	`retailer:zweirad-stadler` / parse	Bulls
model	`retailer:zweirad-stadler` / derived	Bulls Trail Grinder Gravel Bike 28" gold
category	`retailer:zweirad-stadler` / parse	Grinder
frameMaterial	`retailer:zweirad-stadler` / parse	Aluminium
groupsetFamily	`retailer:zweirad-stadler` / dictionary	Shimano GRX \|\| Shimano GRX
electronicShifting	`retailer:zweirad-stadler` / derived	Shimano GRX \|\| Shimano GRX
speeds	`retailer:zweirad-stadler` / parse	12-Gang
brakes	`retailer:zweirad-stadler` / parse	Hydraulische Scheibenbremsen
suspension	`retailer:zweirad-stadler` / derived	suspension fork "SR Suntour GVX32" and no rear shock in a 28-field spec table
fork	`retailer:zweirad-stadler` / parse	SR Suntour GVX32
dropperPost	`retailer:zweirad-stadler` / derived	seatpost row "Bulls Aluminium, 27,2 mm" names no dropper, in a 28-field spec table
beltDrive	`retailer:zweirad-stadler` / parse	Kettenschaltung
lighting	`retailer:zweirad-stadler` / parse	MonkeyLink Recharge (Beleuchtung nicht im Lieferumfang enthalten)
wheelSize	`retailer:zweirad-stadler` / parse	28
powerMeter	`retailer:zweirad-stadler` / derived	absent from a 28-field spec table
availability	`retailer:zweirad-stadler` / derived	2 of 2 sizes orderable

Warnings

info wheel-material-unknown — Wheel material could not be established.

Score breakdown

{
  "frameScore": 11,
  "drivetrainScore": 20,
  "wheelScore": 5,
  "extrasScore": 0,
  "suspensionScore": 0,
  "weightAdjustment": 0,
  "equipmentValue": 36,
  "notes": [
    "Shimano GRX = 20.",
    "Wheels unknown: scored level with basic aluminium, which is neither a reward for omitting the wheelset nor a penalty for naming a cheap one.",
    "Brakes \"hydraulic-disc\" = 0, the baseline for gravel.",
    "Weight not published: no weight adjustment either way."
  ],
  "marketPrice": 1779,
  "valueScore": 1.047,
  "savingsVsMarket": 80
}

AI normalization

{
  "requested": [
    "wheelMaterial",
    "wheelTier",
    "weightKg"
  ],
  "applied": [],
  "rejected": [],
  "notes": "Wheel material and tier are not stated; 'Felgen: Bulls XC-21 EVO TR' is provided but the model is unrecognized for tiering and material cannot be inferred. Electronic shifting is not explicitly mentioned (components list Shimano GRX but no Di2/electronic claim). Weight and power meter are not given.",
  "raw": {
    "frameMaterial": {
      "value": "aluminium",
      "evidence": "Material: Aluminium",
      "confidence": 0.95
    },
    "groupsetBrand": {
      "value": "Shimano",
      "evidence": "Schaltwerk: Shimano GRX",
      "confidence": 0.95
    },
    "groupsetFamily": {
      "value": "GRX",
      "evidence": "Schaltwerk: Shimano GRX",
      "confidence": 0.95
    },
    "electronicShifting": {
      "value": null,
      "evidence": null,
      "confidence": 0.3
    },
    "speeds": {
      "value": "12",
      "evidence": "12-Gang",
      "confidence": 0.95
    },
    "mixedGroupset": {
      "value": "false",
      "evidence": "Shimano GRX 12-Gang Gravel-Schaltung",
      "confidence": 0.85
    },
    "wheelMaterial": {
      "value": null,
      "evidence": null,
      "confidence": 0.3
    },
    "wheelTier": {
      "value": null,
      "evidence": null,
      "confidence": 0.3
    },
    "brakes": {
      "value": "hydraulic-disc",
      "evidence": "Hydraulische Scheibenbremsen",
      "confidence": 0.95
    },
    "weightKg": {
      "value": null,
      "evidence": null,
      "confidence": 0.3
    },
    "powerMeter": {
      "value": null,
      "evidence": null,
      "confidence": 0.3
    },
    "notes": "Wheel material and tier are not stated; 'Felgen: Bulls XC-21 EVO TR' is provided but the model is unrecognized for tiering and material cannot be inferred. Electronic shifting is not explicitly mentioned (components list Shimano GRX but no Di2/electronic claim). Weight and power meter are not given."
  }
}

Normalized record

{
  "id": "zweirad-stadler:bulls-trail-grinder-gravel-bike-28-gold",
  "retailer": "zweirad-stadler",
  "retailerProductId": "bulls-trail-grinder-gravel-bike-28-gold",
  "productUrl": "https://shop.zweirad-stadler.de/fahrrad-shop/rennraeder/gravel-bike/bulls-trail-grinder-gravel-bike-28-gold.html",
  "brand": "Bulls",
  "model": "Trail Grinder Gravel Bike 28\" gold",
  "modelYear": null,
  "category": "gravel",
  "categoryBasis": "stated",
  "sourceCategory": "gravel",
  "price": 1699,
  "originalPrice": 1999,
  "currency": "EUR",
  "discountPercent": 15,
  "frameMaterial": "aluminium",
  "frameModel": null,
  "frameTier": null,
  "groupsetBrand": "Shimano",
  "groupsetFamily": "GRX",
  "groupsetGeneration": null,
  "electronicShifting": false,
  "speeds": 12,
  "mixedGroupset": false,
  "groupsetComponents": {
    "shifters": "GRX",
    "rearDerailleur": "GRX",
    "crank": "GRX"
  },
  "groupsetTierSpread": 0,
  "crank": "Shimano GRX",
  "cassette": "Shimano CS-M7100, 10-45T",
  "brakes": "hydraulic-disc",
  "brakePistons": null,
  "brakeTier": "unknown",
  "suspension": "front",
  "fork": {
    "make": "SR Suntour",
    "line": null,
    "tier": "unknown",
    "travelMm": null
  },
  "rearShock": null,
  "dropperPost": false,
  "beltDrive": false,
  "hubDynamo": null,
  "rack": null,
  "mudguards": null,
  "chaincase": null,
  "kickstand": null,
  "lighting": true,
  "wheelSize": "28",
  "wheelset": "Bulls XC-21 EVO TR | Formula CL-712 | Formula CL-26QR",
  "wheelMaterial": "unknown",
  "wheelTier": "unknown",
  "tyres": "Schwalbe G-One Bite Performance Race Guard TLE, 45-622",
  "weightKg": null,
  "powerMeter": false,
  "powerMeterKind": null,
  "availableSizes": [
    {
      "rawSize": "S = 45 cm",
      "size": "S",
      "sizeCm": 45,
      "inStock": true,
      "stockCount": null,
      "price": null,
      "deliveryNote": "4-8 Werktage"
    },
    {
      "rawSize": "L = 51 cm",
      "size": "L",
      "sizeCm": 51,
      "inStock": true,
      "stockCount": null,
      "price": null,
      "deliveryNote": "4-8 Werktage"
    }
  ],
  "seller": null,
  "availability": "in-stock",
  "gtins": [],
  "imageUrl": "https://shop.zweirad-stadler.de/out/pictures/generated/product/1/1500_1500_100/bulls-28-trailgrinder-gravelbike-gold-133198a.jpg",
  "rawTitle": "Bulls Trail Grinder Gravel Bike 28\" gold",
  "fetchedAt": "2026-09-19T06:32:09.994Z",
  "normalizationConfidence": 0.83,
  "warnings": [
    {
      "code": "wheel-material-unknown",
      "message": "Wheel material could not be established.",
      "severity": "info"
    }
  ]
}

Parsed specification table

{
  "Material": "Aluminium",
  "Farbe": "gold",
  "Gabel": "SR Suntour GVX32",
  "Federweg Gabel": "40 mm",
  "Steuersatz": "FSA ORBIT C40ACB (NO.42/ACB)",
  "Schaltung": "Kettenschaltung",
  "Gänge": "12-Gang",
  "Schaltwerk": "Shimano GRX",
  "Schalthebel": "Shimano GRX",
  "Bremsenart": "Hydraulische Scheibenbremsen",
  "Bremsen": "Shimano BR-RX 400",
  "Bremsscheiben": "Shimano SM-RT30, 160 mm CL",
  "Kurbel": "Shimano GRX",
  "Kassette": "Shimano CS-M7100, 10-45T",
  "Kette": "Shimano CN-M6100-12",
  "Lenker": "Bulls Gravel",
  "Vorbau": "Bulls MTB-S CCS Slot Mount ready",
  "Sattelstütze Art": "Patent",
  "Sattelstütze": "Bulls Aluminium, 27,2 mm",
  "Sattel": "Bulls Gravel",
  "Laufradgröße": "28\"",
  "Felgen": "Bulls XC-21 EVO TR",
  "Reifen": "Schwalbe G-One Bite Performance Race Guard TLE, 45-622",
  "Nabe vorne": "Formula CL-712",
  "Nabe hinten": "Formula CL-26QR",
  "Rücklicht": "MonkeyLink Recharge (Beleuchtung nicht im Lieferumfang enthalten)",
  "Rahmenform": "Gravel",
  "Herstellerfarbe": "dark gold"
}

Raw adapter output

{
  "retailer": "zweirad-stadler",
  "retailerProductId": "bulls-trail-grinder-gravel-bike-28-gold",
  "productUrl": "https://shop.zweirad-stadler.de/fahrrad-shop/rennraeder/gravel-bike/bulls-trail-grinder-gravel-bike-28-gold.html",
  "extractionMethod": "server-html",
  "sourceCategory": "gravel",
  "rawTitle": "Bulls Trail Grinder Gravel Bike 28\" gold",
  "rawBrand": "Bulls",
  "price": 1699,
  "originalPrice": 1999,
  "currency": "EUR",
  "imageUrl": "https://shop.zweirad-stadler.de/out/pictures/generated/product/1/1500_1500_100/bulls-28-trailgrinder-gravelbike-gold-133198a.jpg",
  "rawSpecifications": {
    "Material": "Aluminium",
    "Farbe": "gold",
    "Gabel": "SR Suntour GVX32",
    "Federweg Gabel": "40 mm",
    "Steuersatz": "FSA ORBIT C40ACB (NO.42/ACB)",
    "Schaltung": "Kettenschaltung",
    "Gänge": "12-Gang",
    "Schaltwerk": "Shimano GRX",
    "Schalthebel": "Shimano GRX",
    "Bremsenart": "Hydraulische Scheibenbremsen",
    "Bremsen": "Shimano BR-RX 400",
    "Bremsscheiben": "Shimano SM-RT30, 160 mm CL",
    "Kurbel": "Shimano GRX",
    "Kassette": "Shimano CS-M7100, 10-45T",
    "Kette": "Shimano CN-M6100-12",
    "Lenker": "Bulls Gravel",
    "Vorbau": "Bulls MTB-S CCS Slot Mount ready",
    "Sattelstütze Art": "Patent",
    "Sattelstütze": "Bulls Aluminium, 27,2 mm",
    "Sattel": "Bulls Gravel",
    "Laufradgröße": "28\"",
    "Felgen": "Bulls XC-21 EVO TR",
    "Reifen": "Schwalbe G-One Bite Performance Race Guard TLE, 45-622",
    "Nabe vorne": "Formula CL-712",
    "Nabe hinten": "Formula CL-26QR",
    "Rücklicht": "MonkeyLink Recharge (Beleuchtung nicht im Lieferumfang enthalten)",
    "Rahmenform": "Gravel",
    "Herstellerfarbe": "dark gold"
  },
  "rawFeatures": [
    "S = 45 cm 4-8 Werktage",
    "L = 51 cm 4-8 Werktage",
    "0% Finanzierung ab 169,90 € möglich",
    "Dienstrad-Leasing möglich",
    "14 Tage kostenloses Rückgaberecht",
    "Fahrrad vollständig montiert und mit wenigen Handgriffen fahrbereit",
    "Hochwertiger Aluminium-Rahmen mit edler goldener Farbe",
    "Shimano GRX 12-Gang Gravel-Schaltung",
    "SR Suntour Gravel-Federgabel",
    "Hydraulische Scheibenbremsen",
    "Schwalbe G-One Performance Gravel-Bereifung",
    "Zahlreiche Befestigungsmöglichkeiten fürs Bikepacking"
  ],
  "rawSizes": [
    {
      "rawSize": "S = 45 cm",
      "size": "S",
      "sizeCm": 45,
      "inStock": true,
      "stockCount": null,
      "price": null,
      "deliveryNote": "4-8 Werktage"
    },
    {
      "rawSize": "L = 51 cm",
      "size": "L",
      "sizeCm": 51,
      "inStock": true,
      "stockCount": null,
      "price": null,
      "deliveryNote": "4-8 Werktage"
    }
  ],
  "availabilityText": "2 of 2 sizes orderable",
  "fetchedAt": "2026-09-19T06:32:09.994Z",
  "sourceMeta": {
    "savingBadge": "300 € gespartauf UVP",
    "deliveryWindows": [
      "S = 45 cm 4-8 Werktage",
      "L = 51 cm 4-8 Werktage"
    ]
  }
}

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