M72 Spare wheel

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jackcree
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M72 Spare wheel

Post by jackcree » Thu Jan 04, 2018 2:11 am

Hi, my spare wheel is for 25mm axle.The front and rear wheels are 20mm.All wheels are the later bottle top type.
Any suggestions and help out there?
Jack Creegan

Bmw r69 1959
bmw r100RT 1981
Bmw r65 1981
Triumph 6T 1966
M72 outfit

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jaybird
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Re: M72 Spare wheel

Post by jaybird » Thu Jan 04, 2018 4:02 am

Sorry, I'm not an expert on Russian motorcycles, but I've never heard of a 25mm axle being discussed in regard to these motorcycles. If the brake drum and spacing are compatible you could make a shim for the axle out of thin sheet metal.
Good luck.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
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1974 BMW R 75/6
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Lmo
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Re: M72 Spare wheel

Post by Lmo » Thu Jan 04, 2018 12:06 pm

Hi Jack. 25mm is odd. I wonder if someone installed a 25mm bearing (for some reason). A quick scan of Old Timer Garage, and F2 doesn't show anything but 20mm bearings. Ciang Jiang even uses 20mm bearings.

Dimensions (roller bearing) are: 20x47x15 mm. Wheel bearings are inexpensive. I would just replace it.

edit add: http://www.oldtimergarage.eu/catalog/pr ... ts_id=1611
Lew Morris
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propwash
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Re: M72 Spare wheel

Post by propwash » Thu Jan 04, 2018 12:09 pm

Odd.
If the hub has not been altered then I would try getting the inner parts (bushings, bearings, seals, washers, etc.) to convert it back to 20mm.

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jaybird
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Re: M72 Spare wheel

Post by jaybird » Thu Jan 04, 2018 12:25 pm

New bearings are definitely the best solution, but if I where stuck somewhere with a flat, I'd be wrapping the axle with cut up beer can to get me home for sure.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
2008 Enfield Bullet 500
1974 BMW R 75/6
Etc.

jackcree
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Re: M72 Spare wheel

Post by jackcree » Fri Jan 05, 2018 9:37 am

strange.
Oldtimer lists 25mm axle -part 003.182-for m61 and m72.The bearing size for my spare wheel is 6305 -25x62x17.
I can get bearing 20x62x16 for about 35 euro for pair which will fit 20mm axle and wheel hub. .That leaves spacers etc to source.
Am I wasting my money trying to convert or should I get another m72 wheel?
Cheers
Jack Creegan

Bmw r69 1959
bmw r100RT 1981
Bmw r65 1981
Triumph 6T 1966
M72 outfit

dneprlover
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Re: M72 Spare wheel

Post by dneprlover » Fri Jan 05, 2018 10:13 am

Bottlecap wheels should take standard 30204 taper roller bearings for 20mm spindles. I have never seen any different but anything is possible as far as the Soviets are concerned. The spacer set is the fine thread one as fitted to Dnepr and Ural full width hubs and available cheaply from all the east European sellers on Ebay.

Are ALL the spindles on your bike 20 or 25mm and what is the diameter of the spindle on the spare wheel holder please? If the rear spindle is 25 mm, better to retain the spare you have

Might be better to just get a spare bottlecap. They are not that rare as they were used on Urals from about 1955 until about 1995.
Neval BMW/MT11 800cc hybrid, Neval 2wd MT10-36, Neval standard MT10-36, Neval MT16, another MT11, BMW/MB650 hybrid , K750m and an MB750 with locking diff.

jackcree
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Re: M72 Spare wheel

Post by jackcree » Fri Jan 05, 2018 4:25 pm

ALL 3 axles are 20mm. The spare holder is 16mm.
M61 has 25mm axles and my spare was only for show.
Would a 25x 20 steel tube adapter solve the problem?
Cheers
Jack Creegan

Bmw r69 1959
bmw r100RT 1981
Bmw r65 1981
Triumph 6T 1966
M72 outfit

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