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BSA and T47 threaded bottom brackets, matched to your frame, with a stainless steel bearing upgrade available.
Bottom bracket standard doesn’t change with how you ride — it’s set by your frame’s shell, threaded BSA or the wider-diameter T47, and specced to match your Auren frame automatically as part of the build. T47 has become the more common choice on modern custom titanium frames, allowing a larger-diameter shell with easier servicing and none of the creaking a press-fit design can develop. BSA remains a proven, simpler option, especially relevant if you’re matching an existing frame’s spec. Every bottom bracket takes more repeated load than almost any other part on the bike, so Auren specs stainless steel bearings on the T47 option specifically for the corrosion resistance that matters on a part exposed to sweat and weather on every single pedal stroke.
Bottom brackets are mostly sold as an interchangeable commodity part, a sealed unit in whichever standard your frame happens to use, picked up cheaply and replaced when it starts creaking. Press-fit standards in particular have a reputation for early failure and are a common source of complaints across the industry. Auren specs a threaded standard, BSA or T47, matched to your frame, with stainless bearings as the durability upgrade over a standard sealed unit.
It’s set by your frame’s shell standard, specced automatically as part of your Auren build rather than something you choose separately.
Threaded standards (BSA and T47) are more reliable over the long term. Press-fit designs have a well-known reputation for creaking and premature bearing failure.
Stainless bearings resist corrosion better than standard steel, which matters on a part that’s exposed to sweat and weather every ride and takes load on every pedal stroke.
{confirm with Will} for a specific service interval. A creaking or notchy feel when pedalling is usually the first sign it needs attention.
Yes, a T47-specific tool is needed to remove and install a T47 bottom bracket at home; most bike shops will already have one.
{confirm with Will} for current pricing on BSA versus T47, and the stainless steel upgrade.
Yes, a bottom bracket can be bought separately or added to an existing Auren bike, matched to your frame’s shell standard.
T47 uses a larger-diameter shell, which allows wider tube junctions and easier servicing without a press-fit’s creaking. BSA is a proven, simpler threaded standard, especially relevant when matching an existing frame’s spec.
Yes, it’s specced as the durability upgrade on the T47 option specifically.
{confirm with Will}, since bottom bracket standard is generally set by the frame’s shell, so a conversion usually isn’t straightforward.
A creaking or notchy feel when pedalling is usually the first sign. Left too long, it can eventually damage the frame’s shell.
Yes, like any threaded bottom bracket, it should be installed with grease or anti-seize compound to stop it seizing in the shell over time.
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