Primo BMX Down Topload Stem vs. Haro Bikes Group One Quill Stem vs. Stolen BMX Block Topload Stem - Direct Comparison
3 Stems compared side by side: Primo BMX Down Topload Stem, Haro Bikes Group One Quill Stem and Stolen BMX Block Topload Stem. The lightest is Primo BMX Down Topload Stem at 0.38 kg. The lowest price is Stolen BMX Block Topload Stem at 38.61 EUR. All of them meet this category’s quality markers.
Key Differences
Why buy Primo BMX "Down" Topload Stem?
- ✓ Meets every quality marker: 6061-T6 aluminium, CNC-machined, CrMo
- ✓ Lightest (0.38 kg)
- ✓ Clear pick: meets the quality markers and is the lightest
Why buy Haro Bikes "Group One" Quill Stem - 1 Inch?
- ✓ Meets every quality marker: 6061-T6 aluminium, forged, CrMo
Why buy Stolen BMX "Block" Topload Stem?
- ✓ Meets every quality marker: 6061-T6 aluminium, forged, CrMo
- ✓ Best price (38.61 EUR)
- ✓ Clear pick: meets the quality markers and is the cheapest
Conclusion
- Primo BMX "Down" Topload Stem excels in: weight and quality markers
- Haro Bikes "Group One" Quill Stem - 1 Inch excels in: quality markers
- Stolen BMX "Block" Topload Stem excels in: price and quality markers
Technical Specifications
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| Product | Primo BMX "Down" Topload Stem | Haro Bikes "Group One" Quill Stem - 1 Inch | Stolen BMX "Block" Topload Stem |
| Price |
58.78 EUR Taxfree excl. shipping |
67.18 EUR Taxfree excl. shipping |
38.61 EUR 🏆 Taxfree excl. shipping |
| Manufacturer | Primo BMX | Haro Bikes | Stolen BMX |
| Weight Scale: light to heavy (Stems category) | 0.38 kg 🏆 | 0.56 kg | 0.39 kg |
| Quality markers | 3/3 Quality | 3/3 Quality | 3/3 Quality |
| Material | ✓ 6061-T6 aluminium | ✓ 6061-T6 aluminium | ✓ 6061-T6 aluminium |
| Manufacturing | ✓ CNC-machined 🏆 | ✓ forged | ✓ forged |
| Bolts | ✓ CrMo | ✓ CrMo | ✓ CrMo |
| Specifications | |||
| Stem-Type | Ahead Stem | 1" shafted Stem | Ahead Stem |
| Stem-Style | Topload Stem | Topload | Topload |
| Stem-Material | 6061 Aluminum | 6061-T6 Aluminum (body), 4130 CrMo (shaft, 110mm) | 6061 Aluminum |
| Manufacturing-Method | 100% CNC machined | forged | forged |
| Reach | 48mm | 50mm | 50mm |
| Rise | 24mm | - | 33mm |
| Bar-Clamp | 22.2mm | 22.2mm | 22.2mm |
| Fork-Clamp Diameter | 1-1/8" (28.6mm) | 1" (25.4mm) | 1-1/8" (28.6mm) |
| Recommended for | Street, Park or Trails | Street, Park, Trails | Street, Park, Trails |
| Stack Height | 30mm | - | - |
| Bolts | CrMo, massiv, metric Thread, 6mm Allen Key, 11mm Bolt Head Diamter | CrMo, M8 (1.25mm), 6mm Allen key, 17mm wrench | CrMo, massiv, metric Thread, 6mm Allen Key |
| Extras | designed with Stephan August | - | brass badge |
What makes a good BMX stem?
A good BMX stem is machined from 6061-T6 aluminium; 7075 is the noticeably stronger alloy and therefore the high-end choice. CNC-machined stems hold tolerances better than die-cast ones and keep their clamping force - forged is strong too. The bolts should be CrMo, because they hold bar and steerer under full load. Frontloader or topload is not a quality question but one of bar height and riding style. More on this in the category FAQ
The Brands
About Primo BMX: Primo is a legendary BMX brand with roots dating back to the late 1980s. Originally known for wheelchair racing tires, they transitioned to BMX in... View all Primo BMX products
About Haro Bikes: Haro Bikes is BMX Freestyle. Founded in 1978 by icon Bob Haro in California, the brand not only significantly co-shaped the sport itself but also... View all Haro Bikes products
About Stolen BMX: Founded in 2001 by UK rider and European Champion Anthony Revellder, Stolen BMX is a rider-owned company. They specialize in stylish and solid... View all Stolen BMX products
kunstform Tipps from the Stems category
These are the products we recommend from our own experience - tested, ridden and approved.
Lightest and heaviest: Stems
Weights range from 0.22 kg to 0.56 kg - 0.31 kg on average, 0.31 kg in the middle of the field. The chart shows all 122 comparable products in this category; the markers are the ones being compared.
- 1 Primo BMX Down Topload Stem
- 2 Haro Bikes Group One Quill Stem
- 3 Stolen BMX Block Topload Stem
Lightest
Heaviest
Cheapest and most expensive: Stems
Prices range from 16.76 EUR to 134.41 EUR - 58.75 EUR on average, 62.98 EUR in the middle of the field. The chart shows all 122 comparable products in this category; the markers are the ones being compared.
- 1 Primo BMX Down Topload Stem
- 2 Haro Bikes Group One Quill Stem
- 3 Stolen BMX Block Topload Stem
