Ratio2.78:1
Estimated speed At 90 RPM
Gear
Uses front tire 18×2.1; rear size isn’t listed.
Velopedia Bicycle Archive
2015 Sunday Primer 18
Original specifications: BMX mix drivetrain · 18 wheels · 23.3lbs published weight.
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At a glance
Archive #1524311- Model year
- 2015
- Category
- Kids
- Original MSRP
- $340.00
- Sizes
- 18.5 TT
- Colors
- Military Blue
- Weight
- 23.3lbs
- In this record
- 21 specifications · 2 archived images · original MSRP
Model history 1 other year
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Identification clues
2015 archived details
- Published colors
- Military Blue
- Frame
- Steel, Chromoly Dropouts
- Original equipment
- BMX mix
Clues, not proof of model year. Colors vary and components may have been replaced.
Original buildSteel, Chromoly Dropouts · BMX mix · 18
Frameset
| Frame Construction | welded |
|---|---|
| Frame Material | Steel, Chromoly Dropouts |
| Fork | Primer 18" Fork w/ Chromoly Dropouts |
| Fork Material | Steel |
Drivetrain
| Component Group | BMX mix |
|---|---|
| Crankset | 155mm, 3-piece, Chromoly, Sunday , 25T, Steel |
| Bottom Bracket | 19mm Sealed Mid |
| Rear Cogs | 9t |
| Chain | KMC Z410 |
| Pedals | Sunday Plastic |
Brakes
| Brakes | Odyssey Springfield |
|---|
Cockpit & Contact Points
| Headset | Sunday Integrated, Sunday M6 Pre-Load Bolt |
|---|---|
| Handlebar | Primer 18 7.65" Rise, 25.5" Width, 12° Back, 1 Up° |
| Stem | Sunday Freeze Front-Load Stem 48mm |
| Saddle | Sunday Cloud Seat and Post Combo |
| Seatpost | Integrated |
Wheels & Tires
| Hubs | Sunday, 28H, Low-Flange, Looseball, Sunday, Semi-Sealed, 28H, 9T |
|---|---|
| Rims | 18" 28H Rim |
| Spokes | Steel Black |
| Front Tire | Innova 18 x 2.1" (F & R) |
| Wheel Size | 18 |
No specifications match. Try a component name or clear your search.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Try your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
Innova 18 x 2.1" (F & R)
Replacement search: 18x2.1 bicycle tire Before ordering: Check rim type and tire clearance.
Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.
Parts and service referenceQuick reference before buying parts
Archived specifications for reference. Check the fitted parts before ordering.
- Front tire
- Innova 18 x 2.1" (F & R)
- Drivetrain
- BMX mix
- Bottom bracket / shell
- 19mm Sealed Mid
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.
Full used-bike inspection guide →
Frame and fork
Inspect the frame and fork →Archived: Frame: welded · Fork: Primer 18" Fork w/ Chromoly Dropouts · Steel
Drivetrain
Check drivetrain wear →Archived: Group: BMX mix · Crankset: 155mm, 3-piece, Chromoly, Sunday , 25T, Steel · Bottom bracket: 19mm Sealed Mid · Rear cogs: 9t · Chain: KMC Z410
Brakes
Inspect the brakes →Archived: Brakes: Odyssey Springfield
Wheels and tires
Check wheels and tires →Archived: Wheel size: 18 · Rims: 18" 28H Rim · Hubs: Sunday, 28H, Low-Flange, Looseball, Sunday, Semi-Sealed, 28H, 9T · Front tire: Innova 18 x 2.1" (F & R)
Controls and contact points
Archived: Headset: Sunday Integrated, Sunday M6 Pre-Load Bolt · Handlebar: Primer 18 7.65" Rise, 25.5" Width, 12° Back, 1 Up° · Stem: Sunday Freeze Front-Load Stem 48mm · Seatpost: Integrated · Saddle: Sunday Cloud Seat and Post Combo · Pedals: Sunday Plastic
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Gallery2 images
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.