Classic and Classy Motorcycles Ltd

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1980s Suzuki GSX-R1100 Valuation Report

Date: September 2025

Historical Overview

The Suzuki GSX-R1100, launched in 1986, was the big brother to the GSX-R750. With its 1052 cc oil-cooled inline-four, alloy frame, and aggressive superbike styling, it quickly earned a reputation as the ultimate musclebike of the 1980s. Early “Slabside” and later “Slingshot” models are now highly collectable in the UK.

UK Valuation Summary (by condition)

Condition	Estimated Value (GBP)	Example External Source (plain text)
Project / Restoration Non-runner, incomplete, or high-mileage requiring major work.	£3,500 – £5,000	eBay UK – tired “Slabside” projects sold around £4k. Car & Classic – rough early 1100s offered at £4–5k.
Roadworthy / Presentable Running, tidy bikes; some age-related wear or light mods.	£6,500 – £9,000	Iconic Auctioneers – 1989 GSX-R1100 Slingshot sold £8,280 (Jul 2023). Car & Classic dealer listings £7–9k.
Restored / Excellent High-quality restoration or very original low-mile example.	£10,000 – £14,000	Bonhams Stafford – GSX-R1100 Slabside sold £11,212 (Apr 2024). Dealer asks up to £13–14k for original/restored Slabsides.

Notes: Early “Slabside” GSX-R1100s command a premium over later 1980s/early-1990s “Slingshot” versions. Matching numbers, uncut frames, original fairings and exhausts are critical to value. Modified streetfighters generally sit below these ranges.

Value Influencing Factors

Variant: 1986–88 Slabsides most collectible; early Slingshots gaining ground.
Originality: OEM fairings, paint, exhausts and wheels strongly affect prices.
Condition: Engine rebuilds, carburation, suspension and brakes all costly; paperwork confirming recent work adds value.
Documentation: V5C, history file, MOTs, invoices and provenance boost buyer confidence.
Market timing: Spring Stafford and NEC auctions consistently yield strong hammer prices for collector-grade GSX-Rs.

Conclusion

As of September 2025, Suzuki GSX-R1100 values in the UK typically fall around £3.5–5k for projects, £6.5–9k for roadworthy riders, and £10–14k for restored or excellent examples. Early Slabsides in original trim with provenance are pushing the upper end of this range and beyond.

Sources (plain text):
Iconic Auctioneers — 1989 GSX-R1100 Slingshot sold £8,280 (Jul 2023).
Bonhams Stafford — GSX-R1100 Slabside sold £11,212 (Apr 2024).
Car & Classic — UK classifieds £4k (projects) to £13–14k (restored).
eBay UK — sold projects typically £3.5–5k.

All Valuations