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Discussion Starter · #1 ·
Hello everybody,

I have a Benotto G3 bike, which has front disc brakes and V brakes on the rear.

I'd like to convert the rear brakes to disc.
As i understand, my hub doesn't have the 6 bolts to mount the rotor.
Can someone point me out in the right direction as to what i'd need?.
I found this adapter:
Mr Ride Quaxar Center Lock Disc Rotor Adapter to 6 Bolts MTB Bike Silver Ashima | eBay
but i'n not sure that is what i need. Or would you recommend a new hub?.

thank you so much in advance for any advise.
Javier.

PS: I attached the specs on my bike.
 

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Aloha,

From you description, it sounds like "no".

Can you take a picture of your frame (the left rear) and your rear hub? This will tell us for sure whether it is easily attainable or not.

The link you shared will probably not work. That piece is used to adapt a 6 bolt style brake rotor to a Shimano CenterLock style hub.

Again, put up those pictures and we can tell you exactly what you will need.
 

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There are 4 possibilites -

A hub that will not work with a disc at all.
A center-lock disc hub
A 6 bolt disc hub
A center-lock disc hub that uses a 6 bolt adaptor.

There is no adaptor to make a hub that was never designed for disc, work with a disc.
 

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Normally a bike that comes with a V brake does not have a disc compatible hub.
shimano centerlock hubs and standard 6 bolt hubs are both designed to attach a rotor. A standard non-disc hub has NO WAY to attach a rotor.

Also, you will need disc brake mounting tabs on your chainstay.
 

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Discussion Starter · #6 ·
Normally a bike that comes with a V brake does not have a disc compatible hub.
shimano centerlock hubs and standard 6 bolt hubs are both designed to attach a rotor. A standard non-disc hub has NO WAY to attach a rotor.

Also, you will need disc brake mounting tabs on your chainstay.
Ok, this is what i wanted, this is very useful information.
So first i need to check if my hub is Rotor compatible, either centerlock or 6 bolt.

I case it doesn't, i'd first need to buy a new Hub, right?.

thank you
 

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Discussion Starter · #7 ·
Thank you for the useful information.
I know what i have to do first, check my hub, and take it from there. Maybe i first need a new Hub.

thx
 

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Right. You probably need a new hub, and make sure you have the mounting tabs on your chain stay, to attach the brake.
What model bike do you have? I didn't a find G3 for that brand.
 

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Discussion Starter · #9 ·
You are right, there is no online information about my bike anywhere. Seems like it is a special model made for SAMs (yup, i didn't want to admit it, but it is a SAMs bike, well at least has Shinamo compoments, very very entry level though).
Here is a picture i took some time ago, and if you zoom in on the rear, it seems like there are the tabs on the seat Stay?.
Taking advantage of your knowledge, and now that i'm almost sure i need a new hub, would something like this work?
SRAM x 9 Rear Hub 6 Bolt Disc 135 mm QR | eBay


thank you again
JV




Thank you for replying, i feel i am more on the right track.
 

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Yes it looks like you have the brake mounting tabs.

The hub should work. You just need to make sure the number of spoke holes in your rim is the same as in the hub (32).

That hub is 135mm wide. Your bike very probably takes that size (the 142 size is on newer fancier bikes), but you might just want to measure between your drop outs and confirm it is 135mm.
 

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Discussion Starter · #11 ·
Great !!. I think my rim has 36 holes, but of course i'll make sure.

thank you very much, i now know exactly what i need.

Oh one last question, most of the hubs i see on eBay say "For 8/9 speed....", i'm guessing that since mine has a 7 speed cassette, these 8, 9 or even 10 speed ones should fit, right?.

thanks again
 

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