When we started designing the Raamwerk frameset, one of our most critical decisions was the bottom bracket standard. As engineers who've spent countless hours fixing press-fit failures, we knew we had to get this right.
The T47 decision: Engineering first, marketing never
T47 threaded (T47x68) became our choice after analysing three key failure modes we see in modern cycling:
1. Serviceability crisis
Press-fit systems require precise tolerances (±0.025mm) that most home mechanics can't achieve. T47 threaded systems are self-aligning and forgiving - critical for our target market of builders who maintain their own equipment.
2. Load Distribution Analysis
Our stress analysis showed T47's wider bearing stance (T47 = 47mm ID vs BSA's 34.8mm) distributes crank loads across 35% more surface area. This reduces bearing wear and extends component life, essential for sustainability, durability and riders who track their own maintenance intervals.
3. Component Compatibility Matrix
T47 accepts every major crankset standard:
- Shimano Hollowtech II (with adapter)
- SRAM GXP/DUB (direct fit)
- Campagnolo Ultra-Torque (with adapter)
- Future standards (threaded interface won't change)
The Hidden Cost of Press-Fit
While press-fit frames might save manufacturers €15 in machining costs, they transfer €200+ in lifetime maintenance complexity to the user. For Raamwerk builders - people who wrench on their own bikes - this was unacceptable.
Technical Specifications:
- Thread: T47x1.37 (BSA compatible threading)
- Shell width: 68mm (standard road)
- Bearing support: Full circumferential (vs press-fit's radial stress points)
- Tool requirement: Standard bottom bracket tool (no press required)
Real-World Impact
Upgrading from Shimano to SRAM, vice-versa or to Campagnolo there shouldn't be any struggle on your frame, especially no need to swap complete bikes.. No press, no stress, no bike shop visit required.
Engineering Transparency
Every technical decision we make gets documented and shared with our community. Because understanding your equipment is part of the joy of cycling.