Sp Furo 13 -

The SP Furo 13 is sold direct-to-consumer via SP’s website and through select dealers in Singapore, Australia, and the UK. Shipping to the US takes 7–14 days.

In-the-box contents:

Pro setup tip: Immediately replace the stock rim tape with 25mm Stan’s NoTubes tape. Some users report the stock tape lifting after a few months.

Sodium Phenylpyruvate (SP) is the sodium salt of phenylpyruvic acid. It is a keto-acid derivative of phenylalanine and serves as a critical intermediate in metabolic research. It is widely utilized in clinical diagnostics for the synthesis of substrate reagents used in testing for Phenylketonuria (PKU) and in physiological research regarding hepatic function and amino acid metabolism. sp furo 13

Q: Is the SP Furo 13 hookless? A: Some variants are. Always check the product page. Hookless versions are labeled "TL" (Tubeless) and require compatible tires (e.g., Schwalbe Pro One, Goodyear Eagle F1).

Q: Can I run inner tubes? A: Yes. The wheels are tubeless-ready, but you can use standard clincher tires with butyl or latex tubes.

Q: Are the bearings serviceable? A: Yes. The NTN bearings have 2RS (rubber seal) – pop the seal off, clean, and regrease. The SP Furo 13 is sold direct-to-consumer via

Q: How loud is the freehub? A: Moderately loud. The 54-tooth ratchet produces a angry bee-like buzz. If you prefer stealth, this is not your wheelset.

| Parameter | Method | Value | |-----------|--------|-------| | Kinematic Viscosity @ 40°C | ASTM D445 | 12.8 – 13.5 cSt | | Kinematic Viscosity @ 100°C | ASTM D445 | 3.6 – 4.0 cSt | | Viscosity Index (VI) | ASTM D2270 | ≥ 130 | | Pour Point | ASTM D97 | –45°C | | Flash Point (COC) | ASTM D92 | 210°C | | Copper Corrosion (3h/100°C) | ASTM D130 | 1a (No tarnish) | | Foaming Tendency/Stability | ASTM D892 | 20/0 (Seq I, II, III) | | Four-Ball Weld Load (EP) | ASTM D2783 | ≥ 200 kg | | Demulsibility (54°C, 40-40-0) | ASTM D1401 | < 15 minutes |

SP Engineering recommends servicing the Furo 13 every 30,000 miles or 3 track seasons. Signs that your SP Furo 13 needs attention: Pro setup tip: Immediately replace the stock rim

The chrome plating on the 14mm shaft is exceptionally hard. In our long-term fleet (2 years, 50,000 km), there was zero pitting or corrosion, even through salted winter roads.

We installed a set of SP Furo 13 units on a 2019 Subaru BRZ (a common test mule for the platform) and conducted a two-week evaluation covering 400 miles of highway, mountain passes, and a half-day track session at a technical circuit.