几个顶级的钢架管材制造厂商（此段转编自扶轮文化论坛之钢架天下）：
1. Reynolds，英国，雷诺，历史超过百年
2. Columbus，意大利，哥伦布，格伦巴斯，著名的商标是小鸽子
3. Dedacciai，意大利，简称DEDA，kona explosif目前的管材提供商
4. True Temper，美国，资料查的不多，没太关注
kona explosif从我知道的年代开始，经历了这四个公司的产品，先后是columbus，reynolds，true temper，dedacciai。之前专门查过Columbus和Reynolds的产品，最近又看了一些true temper和dedacciai的产品，感觉四个公司的产品里面最次的是true temper，最强的还是reynolds，其次Columbus和dedacciai难分高下（deda强度更好），具体参 数网上大多能查到，这里不提。
以Baum的山地车架为例：
三个钢架，档次递增，以26的山地车架为例，Cappuccino和Espresso差价800$，Espresso和Ristretto差价750$。介绍分别如下，看看三个架子的选料就能看得出来差别：
The Cappuccino combines a level of workmanship born of tradition with the best aspects of the new breed of high tech steel. Blended from a custom mix of Dedacciai 14.5, 12.5 and Columbus Zona, the Cappuccino is our classic hardtail, bringing the comfort and resilience of modern steel tubes to the elegance and simplicity of an all-purpose mountain frame.
- Individually tailored geometry and women’s specific geometry
- Anti corrosion treatment
- 2D S-Bend chainstays and
mono stay - Stainless steel Wright Bros style dropouts
- Single colour paint scheme
Race ready and enduro worthy, the Espresso uses the finest steel tubing and engineering to stay at the leading edge of off-road performance. The Espresso is a custom blend of Dedacciai 14.5, Columbus Life and True Temper Platinum to suit rider requirements.
- Individually tailored geometry and women’s specific geometry
- Anti corrosion treatment, including inside of all tubes
- Baum proprietary lightened BB shell and relieved head tube
- Quick changer chain catcher
- 2D S-Bend chainstays and
mono stay - Stainless steel Wright Bros style dropouts
The liveliness of steel, the weight of carbon or aluminium. The Ristretto is a no holds barred blend of Reynolds 953 stainless steel, Dedacciai 16.5, and Columbus XCR stainless and Columbus Spirit, customised to individual rider requirements.
- Individually tailored geometry and women’s specific geometry
- Anti corrosion treatment, including inside of all tubes
- Baum proprietary butted and lightened BB shell
- CNC butted and relieved head tube
- 3D S-Bend chainstays and
mono stay - Stainless steel drilled and relieved Wright Bros style dropouts