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A couple disk brake questions....

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A couple disk brake questions....

Old 06-04-07, 12:22 PM
  #1  
montreal_bimmer
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A couple disk brake questions....

im a newB around here.... so first off, i'd like to say hello to all, i dont know much about bikes, my parents bought me one 15 years ago, and i live near a few parks and i use to love to ride around... but its been a while since ive done it, and would like to get back into it....


so ive purchased a Trek 3700, got it brand new, and i got a crazy price, so im happy with it....

now i want to put a set of Avid BB7 disk brakes on it.... here are my questions...

i notice many bikes have just front disks, is it better to have just the front disks or front and rear disks???

what size do you recommend i need for this model bike??

im a car buff, and i do all my own work on my car, how hard is it to install these brakes by myself???

what other parts do i need to swap out to install these disks???

where can i order these disks for a good price(in canada if possible)???

please feel free to add any more info i should need to know....
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Old 06-04-07, 12:30 PM
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Originally Posted by montreal_bimmer
im a newB around here.... so first off, i'd like to say hello to all, i dont know much about bikes, my parents bought me one 15 years ago, and i live near a few parks and i use to love to ride around... but its been a while since ive done it, and would like to get back into it....


so ive purchased a Trek 3700, got it brand new, and i got a crazy price, so im happy with it....

now i want to put a set of Avid BB7 disk brakes on it.... here are my questions...

i notice many bikes have just front disks, is it better to have just the front disks or front and rear disks???

what size do you recommend i need for this model bike??

im a car buff, and i do all my own work on my car, how hard is it to install these brakes by myself???

what other parts do i need to swap out to install these disks???


where can i order these disks for a good price(in canada if possible)???

please feel free to add any more info i should need to know....
the difference between V-brakes and discs may not be worth it, especially if you're happy with the price on the bike. You'll need the calipers, levers, rotors, and 2 new wheels...may be more than you paid for the bike.

easy to do once you have the parts...any lbs carries the parts, they'll not be cheap, but I like to look at what I'm buying so I avoid the web based retailers
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Old 06-04-07, 12:39 PM
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Originally Posted by montreal_bimmer
im a newB around here.... so first off, i'd like to say hello to all
hello

Originally Posted by montreal_bimmer
, i dont know much about bikes, my parents bought me one 15 years ago, and i live near a few parks and i use to love to ride around... but its been a while since ive done it, and would like to get back into it....
if I had a nickel for every time I've heard that one...

Originally Posted by montreal_bimmer
i notice many bikes have just front disks, is it better to have just the front disks or front and rear disks???
both would be better (edit: although apparently not possible with your bike)

Originally Posted by montreal_bimmer
what size do you recommend i need for this model bike??
160mm rotors will be okay

Originally Posted by montreal_bimmer
im a car buff, and i do all my own work on my car, how hard is it to install these brakes by myself???
not hard. what type of bimmer do you have? (e36m3 here)

Originally Posted by montreal_bimmer
what other parts do i need to swap out to install these disks???
New cables, 5mm hex wrench, cable/housing cutters. (edit: after looking at your bike, it appears you will need a new front hub also)
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Old 06-04-07, 12:58 PM
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Originally Posted by gastro
New cables, 5mm hex wrench, cable/housing cutters. (edit: after looking at your bike, it appears you will need a new front hub also)
E90 325i...

so if i decide to go with just the front rotor and caliper, how much am i looking at for everything?? it'll be a DIY...
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Old 06-04-07, 03:50 PM
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You could get in for a buck and a quarter to $300~$400, depending on what level you want to go.

There was a disc hubed front wheel with tire that went un-bid for $9.99 last night on eBay. Your bike shop might be able to hook you up for about $80 for a wheel.

A rotor & caliper on ebay you could score on ebay for around $40, an Avid BB7 will run you $90 at an online retailer.

A new cable will run you $8-15, depending.

You could save some coin on the wheel by buying a hub and sopkes for your current rim and join the wheel builders guild. It's not that hard.

We're looking at making the upgrade on my partners 3700.
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Old 06-04-07, 08:24 PM
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You dont need to go big on the rotors, BB7's are good brakes, You will probably also need to get new cables, and perhaps hubs if your bike isnt disc ready.
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Old 06-04-07, 08:33 PM
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cambria bikes has the BB7s for $59
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Old 06-04-07, 08:41 PM
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i got my bb7s, with compressionless cables(key element), and avid speed dial sevens, with shipping, for about 210, later i found out the compressionless housings didn't come with the cables. so i bought fifty bucks worth of cables and housings, jagwire ripcords. they are amazing.
later i found them at nashbar for 6 bucks with two cables, two housings, ferulles, etc.

so for just the front using your old levers and with compressionless cables, probably about 90 bucks, it is not necessary to get the compressionless cables, but i highly, strongly, and every other word that can possibly be used to emphasize recomend gettting them they are 6 bucks plus about 5.50 shipping from nashbar. They improve braking because they cut down on friction.
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Old 06-04-07, 10:26 PM
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Front is better. Anytime you brake the bike, your own body mass tends forward which shifts the load to the front. As the front is loaded more during braking, this is the one that can brake most effectively. In downhill situations, the rear brake becomes almost useless.

A 160mm rotor should be large enough. But a 185mm won't hurt. Caution: the use of 203mm rotors are only for forks designed to handle the extra forces that the larger rotor is capable of generating.
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Old 06-05-07, 11:33 AM
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Disk brakes on mt bikes became a trend, if your mt bike doesnt have disk brakes it is not even a mt bike. Dont forget that v brakes are just as good. Work on your braking skills, cause that's what matters
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Old 06-05-07, 11:49 AM
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Originally Posted by willtsmith_nwi
Front is better. Anytime you brake the bike, your own body mass tends forward which shifts the load to the front. As the front is loaded more during braking, this is the one that can brake most effectively. In downhill situations, the rear brake becomes almost useless.

A 160mm rotor should be large enough. But a 185mm won't hurt. Caution: the use of 203mm rotors are only for forks designed to handle the extra forces that the larger rotor is capable of generating.
Could someone please provide empirical data that supports this assertion?

It dosen't make sense.
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Old 06-05-07, 12:14 PM
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i think fork companies say this to cover there a$$'s, like on the inside of body armour is says that it won't protect you in the event of a crash. then if you crash and get injured they aren't resposible.
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Old 06-05-07, 12:43 PM
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I love Bavarian automobiles.

E46 325iT here. A Bavarian station wagon.

//

To the OP, I'm also in Montreal. If you're looking for places to ride and people to ride with, check out http://clubveloepic.org. We are a group of people that ride around town. Typically we ride north of the city at Prevost, Sainte-Anne-des-Lacs and all of that surrounding area. We occasionally head south towards Bromont, St-Bruno and we also have an agreement to use the trails managed by Les Coeurs Vaillants on the military base out there.

For getting good deals into Canada. You have to learn which of the online vendors are Canadian friendly when it comes to shipping. Most will accommodate US Postal Service shipping and will avoid Fedex/UPS. The key is to avoid those that use the expensive shipping options especially with respect to brokerage fees. I use Ebay as well and just make sure to pick the right vendors.
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Old 06-05-07, 02:21 PM
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Did I miss it somewhere or did no one mention there may not be any disc tabs on the rear of a 15 year old frame? Kind of just skimmed the replies.
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Old 06-05-07, 02:32 PM
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Originally Posted by nodnerb
Did I miss it somewhere or did no one mention there may not be any disc tabs on the rear of a 15 year old frame? Kind of just skimmed the replies.
Go back and re-read the OP.
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Old 06-05-07, 07:01 PM
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This XT complete set @ $299 is pretty nice if a bit heavy. Hydraulic though, sweet.

http://www.jensonusa.com/store/produ...Wheel+Kit.aspx
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