I have acquired some ex aircraft tyres with ribbed tread which I plan to use on my tandem build.The hubs are plastic.The sealed bearings are 52mm OD and the bearing seats are 50 mm ID.How am I best to ream the seats to fit?

just get 50mm OD bearings. they should come with 25mm centres, so easy to get axles off the shelf(bolts) a 52mm od bearing is a relly odd size, pain in the A . 25/50 really common

My bearing supplier has 52 0D bearing for high speed use and the 50 mm OD for low speed use.What kind of speeds are we talking about here ? Land yacht speeds? More to the point will the low speed ones be OK?

I think you will find the low speed ones will be cheaper , more cheaply made have less balls in them and will not be good at withstanding the side thrust that land yachts give them and so will give up early
The speed is not that important for landyacht use as the speeds are not that great in ball bearing terms but side loads are quite high at times so you need deep groove ball bearings if you want some life out of them

So can I get high speed bearings 50mm OD and 25mm ID? If not I'm back to my original question which is how do I machine the bearing seats down to 52mm

So can I get high speed bearings 50mm OD and 25mm ID? If not I'm back to my original question which is how do I machine the bearing seats down to 52mm

It looks as though Landyacht is going for the low speed 50 od 25 Id ones for you so I guess they are Ok
The nearest high speed ones I can find in the catalogues online are 6304 52 od and 20 Id These are are what I use on my class 5 but it is only a single seater so maybe you need the 25mm axle for a two seater The easy way for you is go with the low speed ones but be prepared to change the bearings often. The good news is they are quite cheap if you shop around

50/25 is a really common size in precision bearings. does your wheel currently take 50/25 crappies ? look inside the hub with the bearing out of the rim and see if theres a lip to stop the bearing going further in.
just reading your original post. the hubs take 50mm Od bearings . 52 is the wrong bearing , so dont change the rim , fit some 50's. PRECISION bearing. F the crappy wheelbarrow bearings off

Hi Tryhard. Carefully check the OD and ID sizes and see if they are of Metric (millimetres) or Imperial (inches) dimensions. I would be inclined to think they are not 50mm OD but are in fact 2" OD and and the shaft size is 1", not 25mm. You can't measure with a rule or the side of a beer can, you must use a micrometer. I ordered bearings from USA via ebay for my tinny boat trailer wheels which were 2" OD on 1" shafts. They were as cheap as chips and better than the Chinese ones. Get the type with Neoprene seals at least on the outer sides.

It's time for me to fess up.The helpful wheel man warned me that the only precision bearings (high speed) were 52 mm OD and I idly recalled some mention in a previous post that someone had machined the hub to fit.I thought this should be a doddle so I went ahead and bought the oversize bearings.So my mistake at my cost.I do own a micrometer which is a marvellous tool to be sure.

50mm x 25mm x 15mm, Deep Groove 6250RS is what your after?
You would have to try VERY hard to destroy these on a yacht other than moisture ingress.


I use a fair few of these (the local golf club fairway mowers use them on their height rollers) and always have a pair of them in the draw for my own use.

Searching again using 6250 as a reference I see them !

I recently bought a set of 400x8 Fallshaw rims. I am having trouble figuring out whether they are 2" or 50 mm. The bore is slightly tapered from 49.93 mm to 50.70 mm (using digital calipers and not a beer can). The local CBC had some imperial R16LL bearings 2"x 1"x 1/2" (50.8 x 25.3 x 12.75). They wanted $20 each, but I can get a packet of 10 for~$60 from USA on ebay. I like the imperial bearings because the recess in the rim is 12.32 mm, whereas the metric 6250RS bearings referred to above are 15 mm wide. I also bought some spacers to suit a 20mm axle and they appear to be 25.71mm OD, but they could probably be knocked in to either size. Can anyone please tell me what bearings I should use on the Fallshaw rim?

Tryhard, on a side note, I too made the mistake of getting 52mm bearings for my original SCA (not recommended) rims. I tried to ream out the bores on my mates turret mill and the whole thing turned out to be a disaster, with the rims now out of centre with a wobble (which is one of the reasons I am replacing them). A lathe with a big enough chuck is the only way to get this right. We all live and learn...

Cheers

All my Fallshaw rims need 2 black adapters to press fit into the rim and then fit the 6004rs bearings to, for 20mm axles.
Or thinner adapters with a bigger outside diameter for bearings (47mm x1" x12mm wide) to fit 1" axles. 6005rs.
The bearings don't fit straight into the red rim. It's tapered to fit the black bearing adapters.

I just went to check for the correct part number and it seems "Easyroll" in Malaga Perth,
www.easyrollmh.com.au/
no longer stock these wheels, according to their website.

I have contacted them by email to check if they are still available.

Now I'm stuffed if they aren't and I need more high quality wheels.

still get them online from here

www.fallshaw.com.au/wheels/pneumatic

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aus230 said..
still get them online from here

www.fallshaw.com.au/wheels/pneumatic

Thanks Vic. I am hoping they are still stocked "locally" in Perth. Freight is the killer.
www.fallshaw.com.au/wheels/pneumatic/plastic
See the small asterix at the bottom of the left hand page about the need for the black adapters when fitting high speed bearings.

I think there is a typo as well. The PWB20 adapters (Right hand side in the very bottom column) are for 42mm x 20mm bearings, as well as taking the same 42mm OD x 3/4" bearings.
It would be the same part number just a different bearing..... Being pedantic.

Chook - if you get stuck, I have a spare set of fallshaws that I snuck into the shed when Anna wasn't watching.

Cant see myself using them for quite a while - sing out if you need them.

Cheers sn but I'm ok for the moment.
Gota do house stuff I've been "informed"

Whenever the winds up, the domestic work is sidelined and I disappear though.

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Chook2 said..
Cheers sn but I'm ok for the moment.
Gota do house stuff I've been "informed"

Whenever the winds up, the domestic work is sidelined and I disappear though.

house stuff . Chook does that mean "woman's work" or general maintenance

The local bearing supplier says bearing 6250 RS is a huge bearing.Please let me know what cataloge is being referred to

I used 6304 RS bearings on my mini. 20mm stub and 52 OD. Just needed to get the wheel housings skimmed out one mil on a lathe. No problem.

I decided to have a go at an online order. they didnt seem to tell just what bearing you would get, couldnt find a way to buy inserts. there didnt seem to be any mention about frieght, so ive cancelled the order and sent a bucket of questions

I don't have a catalogue number nor does my supplier when I rang Adrian. I got 10 of these, 15 months ago (from my account details) and he cant get any more.
I guess the Torro fairway mower, will need a rethink when I use these 2 up.

They have 6250RS ink jetted onto the pack. You cant see it in the pic and the bearings only marking is "Product of Israel" on the bearing outer case.

Sorry for sending you on a wild goose chase.

Chook

I have exchanged my bearings and bought some sleeves

I have measured everything.The inside diameter of my hub is 50mm.The outside diameter of the sleeve is 52mm.The inside diameter is 48 mm.The outside diammeter of the bearing is 47mm. So the sleeve is too big by 1mm and too small by .5mm

So my question for the forum is how am I best to reduce the size of the sleeve to fit the hub,and pack out the size difference between the bearing and the sleeve?
,

It would be worth a try to put them in hot water for a minute or so and then fit them to your rim using the bearing to keep their shape/alignment and pushing them in square with a bit of flat steel and a hammer.

The fallshaw wheels have very loose fitting bearings when the black adapters (that look just like yours) are not pushed into the wheel hub as well.

similar here -

I found the bearings to be a rather sloppy fit into the adaptors, and the adaptors to be a very tight fit into the wheel.

The adaptors do not fit fully home into the Fallshaw wheel either - sitting a touch "proud".

Chook removed a little material from the adaptors so they could seat all the way home when pressed in.

I didn't opt for the hammer fit, I used a big bolt and oversized washers through the bearings/ adaptors and wheel, and tightened the bolt to pull the bearings and adaptors into place.

Once in - the bearings are an interference fit.

stephen

Thanks chaps.As I was pondering this issue just before going to sleep I wondered if a narrow slot cut crossways at the edge of the sleeve would thereby reduce the circumference and the diameter thus solving both the tightness and sloppiness in one move.

They are tight but they fit in my experience
the bolt and oversize washers are the kind way to do it
cutting with a hacksaw could be a last resort if your wheels are tighter than usual
dont forget the spacer tube
Hiko

Thanks Hiko.What is the spacer tube?