Electric Bikes Conversion Kits EMTBS eRoad/Commuting What's New?

holes to fit disc rotor on 500w kit too spaced out

Alan Quay

Alan Quay

Esteemed Pedelecer
Dec 4, 2012
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Devon
Alan Quay

Alan Quay

Esteemed Pedelecer
Dec 4, 2012
2,351
1,076
Devon
Alan Quay said:
That disk an unusual size. All the ones I've ever had are around 44 mm across, which is what I guess you need. Tektro, Avid.....
Click to expand...
Also, I note that it has a thread in the the middle, which is also unusual (in the UK. Do you need a threaded one?
 
A

Andy-Mat

Esteemed Pedelecer
Oct 26, 2018
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thnujag said:
I am not able to fit this disc brake to the Ebike kit. Anyone know which disk brake may fit?

Alomejor Deore 160mm Brake Disc Centre Lock : Amazon.co.uk: Sports & Outdoors

Shop Alomejor Deore 160mm Brake Disc Centre Lock. Free delivery and returns on all eligible orders.
www.amazon.co.uk

This one didnt
Click to expand...
Can you describe the problems you are having and post some sizes of your bike's axle, where the disk should mount please?
Does it not screw onto the wheel axle for example?
And make us some clear photos of the various parts and include a cm ruler in the phots for size gauging.
Look here:-
www.livestrong.com

Correct Size for Bicycle Disc Brakes | Livestrong.com

Disc brakes are one of the main types of bicycle braking systems. Disc brakes are made of a metal disc attached to the wheel hub. The disc braking system includes a caliper that squeezes the brake pads against the wheel, causing the tire to stop rotating. Disc brakes can be hydraulic or cable...
www.livestrong.com www.livestrong.com
Did you measure your original disks before ordering?
There are several different diameters available, and without possibly a special adapter, most will not fit!
Andy
 
Nealh

Nealh

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Centre lock discs can't be fitted to hub motors you need a standard flat rotor with no boss on it, centre locks are for splined Shimano wheel hubs and use a freehub cassette tool to fit the lock ring just as it does on freehub .
That centre lock disc is misleading as in the link it also shows the standard six hole rotor fixing which centre lock doesn't use, look at the 3rd pic on the LHS side bar you can see the internal thread on the centre boss for the lock ring to screw in to.

Alfine/Nexus hub gears use a centre lock disc as they have no rotor holes.
 
Last edited:
Nealh

Nealh

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The disc isn't unusual as it is a common Shimano fixture , the OP has simply bought the wrong item and needs a standard disc rotor.
 
soundwave

soundwave

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soundwave

soundwave

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mike killay said:
What is 'normal'size?
Of these two similar discs, one is 43mm and the other about 47 mm.
Click to expand...
bigger is always better as will get rid of the heat faster and make the pads last longer and stops the rotors warping because of heat build up esp on cheap one piece ones.
 
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mike killay

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Feb 17, 2011
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soundwave said:
bigger is always better as will get rid of the heat faster and make the pads last longer and stops the rotors warping because of heat build up esp on cheap one piece ones.
Click to expand...
I am quoting the hole space, the outer diameter of the discs is the same.
 
soundwave

soundwave

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the space of the bolts is the same but center lock fits on like a cassette with a lock ring to hold it on.

the adaptor kit will let you fit a normal rotor to a center lock hub.
 
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mike killay

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soundwave said:
the space of the bolts is the same but center lock fits on like a cassette with a lock ring to hold it on.

the adaptor kit will let you fit a normal rotor to a center lock hub.
Click to expand...
The space of the bolts is not the same. Nothing to do with centre locks.
 
soundwave

soundwave

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there are no bolt holes on a center lock system op is a bit vague tbh lol
 
Nealh

Nealh

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Opening the Amazon link to the centre lock disc it clearly is one looking at the description and the pics on the LHS side, however it is the first time I have seen one with six disc hole fixings, that said it is a one pieces CL disc and not a two piece floating disc model which I use.
Centre lock hole diameter is smaller then a 47mm rotor and as SW and I have said a lock ring is used just like freehub cassette uses, a freehub cassette tool fits perfectly.
 
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