Myrons Mopeds

 

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1. Cogged Belts

These are also called timing belts and synchronous belts, because like a chain, they cannot slip. There are not many mopeds or mini-cycles with cogged (toothed) belts.

Besides different lengths and widths there are also different pitches and profiles (tooth shapes). So there are thousands of possible cogged belts. The belt length is the tooth count times the pitch. So a 610-5M belt has 610/5 = 122 teeth.

 

 

 

 

 

 

 

Di Blasi: The 1997-on DiBlasi R7E has a cogged drive belt 18mm wide, and has 122 teeth that repeat every 5mm (5mm pitch). 122 x 5 = 610 mm length. One replacement that is shorter is 600-5M-18, with 120 teeth. It fits and meshes correctly, but only when the adjustment slots are lengthened. A 610-5M-18 with 122 teeth is the original size.

Here is a 610-5M-18 in New Jersey.

 

 

 

Laura M56: This engine from Holland is on 1978-80 Batavus and 1982-85 Trac mopeds. The original belt was 20mm wide, had 79 teeth with 5mm pitch. 79 x 5 = 395 mm length. The tooth profile was T5, not 5M. Very similar belts 400-5M-20 and 395-5M-20 do not mesh right.

T5x395-20, price none 

 

Laura M56 with shaved teeth: For many years, there was only a shorter belt available. 78 x 5 = 390 length. It required shaving down the tooth tops of the big pulley. 100’s of bikes had that done. Those bikes would still need a one-tooth-less belt.

T5x390-20, price $18.0

 

 

 

Jawa 210 and 225: The 1983-1995 Jawa 210 and 225 moped models have a cogged belt 25mm wide, and has 51 teeth type T10, that repeat every 10mm (10mm pitch). 51 x 10 = 510 mm length. A 25T10/510 with 51 teeth is the original size.

Here is a 25T10/510 or 510-T10-25 or T10x510-25 in New Jersey. 

 

 

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2. V-Belts

 

Angel or Speed Bird (non variator)
15.0 x 10.0 x 907 original xx $15  Sanwu (Taiwan) 895 3013

Batavus VA, HS50, Starflite (non variator M48 25,30mph)
13.0 x 10.0 x 820 480891 xx Laura (Holland) 480891 A
13.5 x 08.7 x 826 automotive $23.0 Gates XL-9319 13A0815
13.5 x 08.7 x 826 automotive none 17320 (32017)
12.7 x 07.9 x 813 industrial x  none 4L320

Batavus VA, HS50, Starflite (non variator M48 20mph)
09.5 x 09.0 x 860 480893 xx Laura (Holland) 480893
00.0 x 00.0 x 000 substitute  none

Derbi Variant SL, SLE, TT Var. Sport, DS50 (variator)
17.6 x 08.5 x 630  82 26 370  $18 Derbi (Spain) Variant 82.26.37.0

Honda PA50 Hobbit/Camino (variator)
15.0 x 9.0 x 1085 23100-148-7030 B type Mitsuboshi (Japan)
13.5 x 8.7 x 1080 automotive none 17420 (42017) 13A1065
12.7 x 7.9 x 1067 industrial x  none A40 or AX40

Honda NU50 Urban Express (variator)
00.0 x 00.0 x 000 23100…    Mitsuboshi (Japan)
16.3 x 10.3 x 864 industrial   $18  B31 (also BX31)

Motobecane 7, 40, 50, 50V, ’57-64 Wards (variator and non-var.)
14.0 x 09.0 x 830 14756  Optibelt (Germany) 172 115 MB 112 030
16.3 x 10.3 x 864 industrial x none B31 (also BX31)
13.5 x 08.7 x 826 automotive $10 17320 (32017) 13A0815 slips a little
14.0 x 07.9 x 828 substitute  $21 D24 Ventico (France)
12.7 x 07.9 x 813 industrial    none AX30

Peugeot 103 models (variator)
13.0 x 08.5 x 870 48815  Hutchinson 5497 Peugeot N°11 048815
13.5 x 08.7 x 877 automotive $21  17340 (34017) 13A0865
12.7 x 07.9 x 864 industrial    $21  AX32 (also A32)

Peugeot 103 (non variator)
09.5 x 08.5 x 845 48987  Hutchinson 5379 Peug. N°11 048 98700
09.5 x 09.0 x 845 substitute $12  D 255 Ventico (France) D 255

Peugeot 101, 102 (non variator)
09.5 x 8.0 x 735   46068 xxx $12  Hutchinson 5378 Peug. N°11 046 06800
09.5 x 8.3 x 737   industrial  none 3V290 or 3VX290
09.5 x 8.0 x 740? substitute $14  D 213 Ventico (France) D 213

Solo Odyssey (non variator 1 or 2 sp)
10.0 x 06.0 x 730  00 57 176 $18  Optibelt (Germany) Solo 00 57 176
09.5 x 08.3 x 725 industrial   none 3V285 or 3VX285

Vespa Ciao C7N, C7E (non variator)
09.7 x 09.0 x 970  102905 x  $19  Pirelli (Italy) 2931-102905/9
11.9 x 07.9 x 978 automotive $15  15380 (38015) 11A0965 orig pulley 94
09.5 x 09.0 x 972 automotive none 10A0960C  original pulley 94mm
09.5 x 09.0 x 952 automotive none 10A0940C  smaller pulley 75-80mm
09.5 x 09.0 x 937 automotive none 10A0925C  smaller pulley 65-70mm

Vespa Ciao C7V (variator)
13.0 x 07.0 x 975 102906 xx $15  Pirelli (Italy) 2632-102906/9
12.7 x 07.9 x 965 industrial  none A36 AX36

Vespa Bravo, Grande (variator)
13.0 x 7.0 x 1050 130937 xx Pirelli (Italy)
12.7 x 7.9 x 1041 industrial x none 2410 (4L410)
12.7 x 7.9 x 1041 industrial x $19.0 AX39
11.9 x 7.9 x 1042 automotive none 15405 (40515) 11AV1030 slips a little

Vespa Si, Boxer (non variator)
09.5 x 9.0? x 1143? 124593   Pirelli (Italy)
09.5 x 1140/1150 substitute  none

Vespa Si, Boxer (variator)
13.0 x 7.0 x 1143? 122192 xx Pirelli (Italy)
12.7 x 7.9 x 1092 industrial x none  2430 (4L430)

Vespa (unknown) (non variator)
09.7 x 8.5 x 1050 unknown    $15   TD? 5332

 

 

V-Belts Explained

The smooth sides of V-belts are what grips the pulley. The harder the pull, the more it grips, because of the V angle. The top and bottom do not touch anything. 

First is a graphic showing the cross-sectional shapes and sizes of replacement V-belts that can be used on mopeds and small scooters. V-belts for variators (variable pulleys) are the “low profile” type, called “variable speed belts”. V-belts for fixed pulleys are the “high profile” type, called either “classic” or “cogged”, see below.  

V-belts are made by Gates in different styles, widths, and lengths. Here the width choices from 9.5 to 17.5 mm. Larger or smaller sizes are omitted. 

9.5 mm  3L, 3V, 3VX
10.0 mm 10X, SPZ, XPZ
11.9 mm automotive 15
12.7 mm 4L, A, AX
13.0 mm 13X, SPA, XPA
13.5 mm automotive 17
15.9 mm 5V, 5VX
16.0 mm SPB, XPB
16.7 mm 5L, B, BX
17.0 mm 17X
17.5 mm automotive 22

Smooth or Notched: The notches, or cogs, on V-belts are not teeth, like on toothed belts. They are relief slots that help the belt bend easier, for less friction and more efficiency. Equipment that originally had smooth belts can use cogged belts, and visa versa.

   

 

Batavus/Laura M48 20mph v-belt: So far there is only a part number and a photo, but no width, length or belt number available. It’s size can only be estimated from this photo. If anyone knows, please tell Shaun by email.

 

More about V-belts: http://www.smex.net.au/reference/Vbelts02.php