Primo BMX Down Topload Stem vs. Haro Bikes Group One Quill Stem vs. Stolen BMX Block Topload Stem - Direct Comparison
3 BMX 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 46.95 EUR. All of them meet this category’s quality standard.
Key Differences
Why buy Primo BMX "Down" Topload Stem?
- ✓ Meets 3 of 3 quality markers: 6061-T6 aluminium, CNC-machined, CrMo
- ✓ Lightest (0.38 kg)
Why buy Haro Bikes "Group One" Quill Stem - 1 Inch?
- ✓ Meets 3 of 3 quality markers: 6061-T6 aluminium, forged, CrMo
Why buy Stolen BMX "Block" Topload Stem?
- ✓ Meets 3 of 3 quality markers: 6061-T6 aluminium, forged, CrMo
- ✓ Best price (46.95 EUR)
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 |
73.95 EUR Taxfree excl. shipping |
71.95 EUR Taxfree excl. shipping |
46.95 EUR 🏆 Taxfree excl. shipping |
| Manufacturer | Primo BMX | Haro Bikes | Stolen BMX |
| Weight Scale: light to heavy (BMX Stems category) | 0.38 kg 🏆 | 0.56 kg | 0.39 kg |
| Variants & availability |
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| 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 |
| Buy now View product | Buy now View product | Buy now View product | |
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 Picks from the BMX Stems category
Our history with BMX parts did not start when we opened kunstform in 2003: some of the team have been riding longer than the shop has existed, and most of us are still on a bike today. So we know pretty well which parts we can trust. A kunstform Pick therefore only goes to what we would bolt onto our own bikes: parts where the quality and the value are right, and that you will enjoy for a long time.
Lightest and heaviest: BMX Stems
Weights range from 0.19 kg to 0.56 kg - 0.31 kg on average, 0.31 kg in the middle of the field. The chart shows all 129 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: BMX Stems
Prices range from 10.95 EUR to 106.95 EUR - 62.24 EUR on average, 66.95 EUR in the middle of the field. The chart shows all 129 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
