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Gearbox & Speedo Ratio Calculator (Metric)
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
165/60 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
165/70 x 13
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 (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)
MED 4 speed Dog Kit
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 )
4.307:1 13/56 ( Special )
4.571:1 14/64 ( Special )
TPK of Speedo
900 - 160kph Smiths (unknown source)
880 - 160kph Smiths central ('60s Cooper)
880 - 140kph Smiths central (unknown source)
860 - 140kph Smiths central (850)
820 - 140kph Smiths Early tri'clock
812 - Late Cooper 180kph Nippon Seiki
800 - 200kph Smiths central Cooper S
800 - 140kph Smiths central Pre 84'
780 - 160kph Smiths (Austin 1300GT)
780 - 200kph Smiths (1275 GT/25/1100 Special)
776 - 140kph Nippon Seike
760 - 140kph Smiths post '84
700 - unknown speedo
625 - 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
16
32
48
64
80
96
112
128
144
160
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 - Reverse Idler Bush
One piece reverse idler bush which can be used to replace the problematic split bush used in 80's A+ gearboxes. Standard for all other gearboxes.
Will need machining to size once fitted.
more.......
£ 4.50 + VAT
Learn more about this product, or purchase.
Learn more about Guessworks Gearboxes
Imperial
Metric
0800 0248454
or 07526 483268
