Without guarantee, most of the data are from the WWW/MR128 , if the information is from me, appears out of the text context.
Rims
2 sizes of rims and to “deeps” have been fitted. Following the Rims from my “Fundus”
A therotical offset
A1 calculated offset = D – (B + 5) / 2
| Size [inch] | Punch/ Marking | A [mm] | A1 [mm] | B [mm] | C [mm] | D [mm] | E [mm] |
| 41/2J15 | – | (45) | 47.35 | 114,3 | 120 | 107 | +12 |
| 5J15 | – (Couchette) | (45) | 44 | 127 | 132 | 110 | +6 |
| 5J15 | 5J15 Dunlop SA R2034 5 79 | (45) | 45 | 127 | 132 | 111 | +9 |
| 5J15 | – | (33) | 31 | 127 | 132 | 97 | -8 |
| 5J15 | 5J15 Dunlop SA R2037 0 73 | (33) | 31 | 127 | 132 | 97 | -7 |
| 5J15 | 5J15 Dunlop SA R1936 72 | (33) | 32 | 127 | 132 | 98 | -9 |
| 5J15 | 5J15 Dunlop SA R1936 | (33) | 30 | 127 | 132 | 96 | -9 |
4-1/2 J15
Rim mouth width 114.3 mm (4.5 inch)
Rim width outside ca. 120 mm
Offset* 45 mm (47)
Deep** ca. 107 mm
Measure E = +12 mm
5J15 no name (Couchette)
On my Couchette (1970) i found unmarked 5J rims
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 45 mm (44)
Deep** ca. 110 mm
Measure E = +6 mm
5J15 Dunlop SA R2034 5 79
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 45 mm (45)
Deep** ca. 111 mm
Measure E = +9
5J15 no name
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 33 mm (31)
Deep** ca. 112 mm
Measure E = -8 mm
5J15 Dunlop SA R2037 0 73
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 33 mm (31)
Deep** ca. 111 mm
Measure E = -7 mm
5J15 Dunlop SA R1936 72
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 33 mm (32)
Deep** ca. 98 mm
Measure E = -9 mm
5J15 Dunlop SA R1936
Rim mouth width 127 mm (5 inch)
Rim width outside ca. 132 mm
Offset* 33 mm (30)
Deep** ca. 96 mm
Measure E = -9 mm
* According to MR128, the 5J15 rims (mounted from approx. 1970 (?) was introduced to enable snow chains
** measured from the inner edge of the rim to the supporting surface (see pics)
Tires
165R15
Are no more or very difficult to obtain
Rolling circumference ca. 1970 mm
175R15
Are no more or very difficult to obtain
Rolling circumference ca.: 2000 mm
185R15C
Easy to get, many manufacturers
Rolling circumference ca, : 2037 mm
175 80 R15 (Alternative)
Rolling circumference ca. 2014 mm
Some of my club colleagues using the nangkang exonex na-1 175/80 r15
Expérience
With the Michelin winter tyres 165R15 on my “Couchette” I have a tacho deviation of about 10% – with the summer tyres 185R15 it’s about 3% (both with about 80% profile). The available 185’s are normally reinforced versions (C) for vans – the TIGARs on my “Couchette” give a slightly lethargic but comfortable drive feeling and reduce engine noise and fuel consumption – I would do it again. With the 185’er TIGAR and the 5 J15 (45mm) rims, there is still about 8mm of distance between bering ball and the mounting surface of the rim.
For Louise with 5 J15 (33mm) and the 185’er Hancook, it is about 15mm of distance.
Type approval in Switzerland
According to the type approval documents CH, it can be said in general that:
– the high roof models (Estafette 1000) are registered with an axle load of 1200 (600 kg per wheel) and with dimension 175R15
– while the low buses (Estafette 800) are registered with an axle load of 1100 (550 per wheel) and with dimension 165R15
Unfortunately, the type approval documents do not refer to the rim size. Technically, for 5 inch rims, tyres from 155 – 185 are possible
and for 4 1⁄2 inch, tyres from 145 – 175 are possible
Must a change of tyre dimension be verified?
No, if the total speed does not deviate by more than ±8 per cent from the original speed and the ETRTO wheel/pneumatic assembly standard is met.