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The 1998 Isle of Man TT was the 92nd edition of the event. Due to the high amount of rainy days, the Sidecar Race A was cancelled. It was only the second time a race was cancelled in the history of the event. The TT Formula One was also postponed by a day.^[1]

Ian Simpson was the only rider to win muptiple races, taking the opening and closing races, the Formula One TT and the Senior TT. It was Simpson's last participation at the TT as leg injuries prevented him from competing in 1999, before forcing him into early retirement in early 2001.^[2]

Three competitors died during the event, Mike Casey, Ian Hardisty and John Henderson.^[3]^[4]^[5] A fourth rider, 66-year old Jack Trustham, died of a heart attack during a parade lap commemorating Honda's achievements on the island.^[6]

Results

Formula One TT

Rank	Rider	Machine	Time	Speed (mph)
1	Ian Simpson	Honda	1.16.15.6	118.74
2	Michael Rutter	Honda	1.16.17.8	118.68
3	James Courtney	Honda	1.16.36.5	118.2
4	Simon Beck	Kawasaki	1.16.51.3	117.82
5	Jason Griffiths	Honda	1.17.43.5	116.5
6	Dave Morris	Chrysalis AMDM	1.20.14.1	112.85

Lightweight TT

Rank	Rider	Machine	Time	Speed (mph)
1	Joey Dunlop	Honda	46.51.8	96.61
2	Bob Jackson	Yamaha	47.34.7	95.16
3	John McGuinness	Yamaha	47.48.6	94.69
4	James Courtney	Honda	48.08.0	94.06
5	Jason Griffiths	Honda	48.32.4	93.27
6	Gavin Lee	Yamaha	48.40.6	93.01

Sidecar Race B

Rank	Rider	Passenger	Machine	Time	Speed (mph)
1	Dave Molyneux	Doug Jewell	Bullock DMR Honda	1.03.45.1	106.52
2	Kenny Howles	Nick Crowe	Ireson Yamaha	1.05.04.4	104.36
3	Gary Horspole	Kevin Leigh	Shellbourne Honda	1.05.12.3	104.15
4	Roy Hanks	Phillip Biggs	Rose/Molyneux Yamaha	1.05.13.8	104.11
5	John Holden	Ian Watson	DMR Yamaha	1.05.15.7	104.06
6	Mick Boddice Jnr	Ian Simons	Windle Honda	1.06.24.1	102.27

Ultra Lightweight TT

Rank	Rider	Machine	Time	Speed (mph)
1	Robert Dunlop	Honda	1.03.50.3	106.38
2	Ian Lougher	Honda	1.04.08.2	105.88
3	Owen McNally	Honda	1.04.30.1	105.29
4	Gary Long	Honda	1.04.38.0	105.07
5	Gary Dynes	Honda	1.05.08.6	104.25
6	Garry Bennett	Honda	1.05.18.6	103.98

Singles TT

Rank	Rider	Machine	Time	Speed (mph)
1	Dave Morris	Chrysalis BMW	1.03.11.2	107.48
2	Jim Moodie	Sanyo Honda	1.03.30.4	106.93
3	Mick Jeffreys	Spondon Rotax	1.08.09.2	99.64
4	Robert A Price	Kawasaki	1.08.22.8	99.31
5	Terry McGinty	Harris Suzuki	1.10.43.5	96.02
6	Keith Dixon	Seeley G50 Special	1.10.56.0	95.74

Junior TT

Rank	Rider	Machine	Time	Speed (mph)
1	Michael Rutter	Honda	59.22.7	114.37
2	Ian Simpson	Honda	59.29.4	114.16
3	Paul Dedman	Honda	1.00.07.3	112.96
4	Bob Jackson	Honda	1.00.08.2	112.93
5	Chris Heath	Honda	1.00.24.5	112.43
6	Jim Moodie	Honda	1.00.26.8	112.35

Production TT

Rank	Rider	Machine	Time	Speed (mph)
1	Jim Moodie	Honda	56.58.7	119.15
2	Nigel Davies	Kawasaki	57.27.7	118.19
3	Michael Rutter	Honda	57.29.0	118.14
4	David Jefferies	Yamaha	57.45.5	117.58
5	Bob Jackson	Yamaha	58.14.5	116.6
6	Paul Hunt	Yamaha	58.17.5	116.5

Senior TT

Rank	Rider	Machine	Time	Speed (mph)
1	Ian Simpson	Honda	1.53.23.1	119.79
2	Bob Jackson	Kawasaki	1.53.26.8	119.72
3	James Courtney	Honda	1.53.57.3	119.19
4	David Jefferies	Yamaha	1.55.09.0	117.95
5	Jason Griffiths	Honda	1.55.35.2	117.51
6	Nigel Davies	Yamaha	1.56.14.2	116.85

Notes

^ "TT 1998".
^ "TT Website Interviews - Ian Simpson". www.ttwebsite.com. Retrieved 2023-12-22.
^ "Motorsport Memorial -". www.motorsportmemorial.org. Retrieved 2023-12-22.
^ "Motorsport Memorial -". www.motorsportmemorial.org. Retrieved 2023-12-22.
^ "Motorsport Memorial -". www.motorsportmemorial.org. Retrieved 2023-12-22.
^ "Motorsport Memorial -". www.motorsportmemorial.org. Retrieved 2023-12-22.