Lightest A1 naked at 134kg
vs MT-125 (142kg), Duke 125 (159kg)
GSX-S125 is the lightest A1-licence naked motorcycle on UK sale: 134kg wet vs Yamaha MT-125 (142kg, 8kg heavier) and KTM 125 Duke (159kg, 25kg heavier). Lower weight = sharper handling, lighter feel at parking speed, easier for shorter/lighter riders. Suzuki's class-leading number.
GSX-R styling DNA
Sportbike face on a naked
GSX-S125 wears the family face of Suzuki's GSX-R supersports — angular triple-LED headlight, sharp tail, aggressive lines. Side-by-side with the GSX-R125 (its faired sister), the styling relationship is obvious. Most rival 125 nakeds (MT-125 emulates MT-09, Duke 125 emulates Duke 1290) follow the same family-face strategy.
Why Suzuki entered the segment late
Commercial caution
Suzuki had no 125 naked sportbike for 21 years (1995-2017). The decision was taken seriously inside Suzuki — the firm watched KTM 125 Duke (2011) and Yamaha MT-125 (2014) prove the segment before committing R&D. Result: GSX-S125 launched 2017, four years after MT-125 — but with the lightest weight in class and 6-speed gearbox (rivals had 6-speed by then too).
Telescopic forks vs USD
Cost-cutting compromise
GSX-S125 uses conventional telescopic forks (not USD). KTM 125 Duke (USD WP), Yamaha MT-125 (USD KYB), Aprilia Tuono 125 (USD) all have upside-down forks. Suzuki saved ~£200/bike by using telescopic — passed to buyers as a £200-£400 lower price than rivals. Trade-off: less rigid front end, slightly less premium feel.
Slip/assist clutch (S-WAS)
Class-standard
Suzuki S-WAS (Slip-Assist Clutch) — same tech name as on GSX-R1000R. Lighter clutch lever pull, prevents back-torque locking on aggressive downshifts. Now standard on all serious A1 nakeds. GSX-S125 was one of the first to bring it down to A1 segment in 2017.
Low-stage power feel
Smooth, not aggressive
GSX-S125 makes 14.6bhp at 10,000rpm — but the power delivery is smoother and lazier than the rev-happy KTM 125 Duke or VVA-equipped Yamaha MT-125. New riders find it less intimidating; experienced riders find it less exciting. For learners, this is a feature; for riders wanting to upgrade soon, it's a limitation.
Suzuki UK dealer network
Thinnest of major brands
Suzuki has the smallest UK motorcycle dealer network of the major brands — about 60 dealers vs Honda's 130, Yamaha's 110, BMW's 50. For a learner or A1-rider needing service, finding a local Suzuki dealer is harder. Counter-argument: Suzuki dealers tend to be specialised, well-stocked, and competitively priced.
Insurance + run costs
~£600/year
Insurance group 5 (low). UK fully-comp ~£200-£280/year for a 25+ rider. 110mpg real-world. Service intervals 6,000 miles, Suzuki dealer prices ~£140-£180. Realistic annual cost (insurance + tax + service + tyres + fuel for 5,000 miles): ~£600-£700. Cheapest A1 naked to run — narrowly beating MT-125 (~£700-£800/year).
