What size wheel hub bearings for Rockrider 540 MTB?

[xzenonuk]

hey guys/lassies my mtb has been giving me a bit of flack on its wheel hubs for a while,

what size bearings should i be looking for to replace them?

front wheel is really annoying me and some of the bearings have a dull couloring on spots instead of been shiny.

its the old black/grey/orange rock rider 540 https://www.decathlon.co.uk/rockrider-540-mountain-bike-id_8293149.html

got over 3000 miles on it and recently changed the cassette

 

[mjr]

Measure them? There's only a few sizes common in loose bearings.

 

[iluvmybike]

If its ball bearings then highly likely to be 1/4" in rear and 3/16" front - but do check

 

[Tim Hall]

Or take an old one to the shop and ask for more like it, but shiny.

 

[xzenonuk]

kool thanks guys, ill have a look

 

[xzenonuk]

ordered some earlier from simply bearings, the 2 sizes mentioned above, 50 of each and all under a tenner, even if they don't fit i have other uses for them and their so cheap

got some michelin tyres for it as well in decathlon earlier 2.0 size ones with loads of tread as my current ones are only 1.65 and the bike originally had 2.10 ones, figured i had better get some grip for this winter as this time last year i sprained my ankle on it lol

ill fit all at the same time if bearings are the right size when they arrive, then my mtb will be all set up for some winter abuse, with new bearings in wheels, new chain, new cassette and grippy tyres

shifting like a dream on the new cassette and chain never had to adjust the sram x7 on the back or the front shimano deore

 

[xzenonuk]

new tubes and nice chunky tyres on it now and the front hub has the new bearings in, i noticed i could fit 9 in each side and i only counted 8 of the old ones on each side lol

hope thats the nippy front wheel sorted for a good while now

 

[xzenonuk]

just a bump incase any one has the same bike or stumbles on this from google,

i done the back wheel hub earlier and it takes the same size of bearings as the front one, glad i bought 50 of each hehe, what ever size is bigger is the correct one out the 2 mentioned above for front and back, counted 9 on each side and could only fit in 9 on each side so all good for winter now and got about 14 of the bigger bearings left over and the front wheel has been behaving itself on a few rides