Putting the speedometer for my 1961 850 back together and I find I have 2 different glasses. One is flat and the other curved. I believe that the curved one is correct, but can anyone confirm - Thanks in Advance. John K.

My 850 speedo glass is convex.

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There are two types of glass I have come across (haven't pulled apart that many speedos though) concave (early silver faces speedo) and convex (later black faced speedo).

So ALL the glass is the same just fitted convex or concave ?

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There are two types of glass I have come across (haven't pulled apart that many speedos though) concave (early silver faces speedo) and convex (later black faced speedo)...is the answer

[Edit: for the life of me, I don't recall ever seeing a concave glass in an early Mini speedo...I wonder if some people just put them in the wrong way when reassembling them?]

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[Edit: for the life of me, I don't recall ever seeing a concave glass in an early Mini speedo...I wonder if some people just put them in the wrong way when reassembling them?]

+1

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I just looked at my daughters 850 (silver face) and the glass is concave.
Don't know if this has ever been pulled apart but it is not currently working so it must be original

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The first production Mini in the Gaydon museum has concave glass.

I think most Mini speedos have concave glass, unless the glass has been refitted back to front.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I have a few silver face old Speedos I will have a look tomorrow if I remember. JK.

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Concave glass on early instruments and convex later. There is also more than one size of glass as in some speedo's the rubber fits on the glass and others below the glass. As a consequence there are different masks below the glass and bezel.

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1960 Morris Mini Minor

Later Mokes (with UK speedos) have flat glass.

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian

Yes and a different profile on the black bezel

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1960 Morris Mini Minor

Yes the bezel profile changed from pointy to rounded as a safety measure, I assume there were huge numbers of people getting large circles cut out of them like cookies.

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian