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Gearbox & Speedo Ratio Calculator
Ratio Calc
Speedo TPM
Engine Nos
Xpin Guide
Spigot Bearing
Synchro Tool
Rebuild Guide
Ministox
Windage Tray
Select Details
Tyre Size
145 x 10
165/70 x 10
145/70 x 12
165/55 x 12
165/60 x 12
175/50 x 13
195/45 x 13
195/50 x 13
135 x 12
150/65 x R315
155/70 x 12
160/65 x 12
160/65 x R315
185/55 x 13
145 x 13
155 x 13
500L10 (Dunlop Race Tyre)
185/70 x 13
205/40 x 17
Drop Gear Ratio
1:1 (Standard)
0.9666:1 (30/29 A+ Eco Primary/Std Input)
0.9655:1 (29/28 A+ Std Primary/Eco Input)
0.9333:1 (30/28 A+ Eco Primary/Eco Input)
0.9580:1 (24/23)
1.0416:1 (24/25)
1.0435:1 (23/24)
1.0450:1 (22/23)
1.0869:1 (23/25)
1.0900:1 (22/24)
1.1364:1 (22/25)
Gearbox type
MKI Mini Pre '64 (Magic Wand)
MKI/II Mini Post '64 (Magic Wand)
MkI/II Cooper & MkI/II/III Cooper 'S'
MkI/II/III Cooper 'S' (Close Ratio / Straight Cut )
MkIII Cooper 'S' & 1275 GT (Close Ratio)
MKIII/IV Mini & Metro (pre A+ <'84)
MKV/VI/VII Mini, ERA Turbo & Metro (A+ >'84)
Metro 1.3 HLE (Double grove A+)
Guessworks (Developmental Straight Cut) GW-SCCR4ROAD
Guessworks (Clubman ratios CR/SC) GW-SCCR4
Guessworks (Abingdon ST ratios CR/SC) GW-SCCR6
Minispares (Clubman ratios CR/SC) C-STN39
Minispares (Abingdon ST ratios CR/SC) C-STN77
Minispares (Metro Challenge CR/SC) nla?
Minisport (Abingdon ST ratios CR/SC) GRBMS4014
TRAN-X (Abingdon ST ratios CR/SC)
TRAN-X (Clubman ratios CR/SC)
JKD (Abingdon ST ratios CR/SC)
JKD Involute 4 speed Dog Kit (2.31:1 1st)
JKD Involute 4 speed Dog Kit (2.16:1 1st)
JKD Involute 4 speed Dog Kit (2.02:1 1st)
JKD Involute 4 speed Dog Kit (1.75:1 1st)
KAD 4 speed Dog Kit (2.173:1 1st)
MED 4 speed Dog Kit (2.239:1 1st)
Quaife 4 speed Dog Kit (2.3:1 1st)
Quaife 4 speed Dog Kit (2.1:1 1st)
Quaife/Swiftune 4 speed Dog Kit (US Spec 1.692:1 1st)
JKD Involute 5 speed Dog Kit
KAD 5 speed Dog Kit
Minispares 5 speed Helical Gearset
Minispares 5 speed SCCR Gearset
Minispares 5 speed Heavy Duty Helical
JKD 6 speed Dog Box
Final Drive Ratio
2.760:1 21/58
2.950:1 20/59 ( Metro 1.3 HLE '85 on )
3.105:1 19/59 ( Metro 1.0 HLE & Some 1.3 HLE's )
3.211:1 19/61 ( MG Metro Turbo )
3.444:1 18/62 ( Most Mini's & post '84 Metro's )
3.647:1 17/62 ( Metro City, L & Van )
3.765:1 17/64 ( MKI Mini, 850's and Vans)
3.939:1 16/63 ( Option on Cooper "S" MKI/II/III )
4.133:1 15/62 ( Option on Cooper "S" MKI/II/III )
4.267:1 15/64 ( Option on Cooper "S" MKI/II/III )
4.350:1 15/65 ( Option on Cooper "S" MKI/II/III )
3.667:1 15/55 ( Straight Cut )
3.875:1 16/62 ( Special )
4.307:1 13/56 ( Special )
4.571:1 14/64 ( Special )
TPM of Speedo
1440 - 100mph Smiths (unknown source)
1408 - 110mph Smiths central ('60s Cooper)
1408 - 90mph Smiths central (unknown source)
1376 - 90mph Smiths central (850)
1312 - 90mph Smiths Early tri'clock
1300 - Late Cooper 110mph Nippon Seiki
1280 - 120mph Cooper S Smiths central
1280 - 90mph Smiths central Pre 84'
1248 - 900mph Smiths central
1248 - 100mph Smiths (Austin 1300GT)
1248 - 120mph Smiths (1275 GT/25/1100 Special)
1242 - 90mph Nippon Seike
1216 - 90mph Smiths post '84
1120 - unknown speedo
1152 - unknown speedo
1000 - All Metro's & Most modern aftermarket
Worm & Pinion ratio
7/15
7/16
7/17
7/18
6/16
6/17
6/18
5/16
5/17
5/18
Calculated Speed by RPM in each Gear
0
10
20
30
40
50
60
70
80
90
100
1000
2000
3000
4000
5000
6000
7000
8000
RPM
Actual Speed vs (Speedo Reading)
RPMx100
Gear
10
20
30
40
50
55
60
65
70
75
80
1st
2nd
3rd
4th
5th
6th
Guessworks Feature Product - Differential shaft output cover (Rod)
Differential output cover for rod change gearbox, Pot, or rubber coupling, NOT Cooper S Hardy spicer.
Reconditioned unit with new bush fitted and machined to size
more.......
£ 35.00 + VAT
Learn more about this product, or purchase.
Learn more about Guessworks Gearboxes
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0800 0248454
or 07526 483268
