|   Magura Marta with 8" rotors OK? | duc135
Jan 14, 2004 9:40 AM | | I have a set of Martas from another bike and was wondering if there were any isues of any sort to use them with 8" rotors. Are they strong enough to take the additional stresses or should I just buy a new set of brakes. If I need new brakes, which would you suggest? BTW I'm planning on putting it on a SC Bullit.
Duc |
| missing lots of info but | JimC.
Jan 14, 2004 3:28 PM | | I'd say no, get the Gustavs for 8" and your Bullit, you'll need them. Jim MCM #11(bullit with gustavs) C |
| missing lots of info but | duc135
Jan 14, 2004 4:25 PM | | Jim,
What info do you need? I'm only 130 lbs., do 5'-6' drops and like to go fast down hills (not crazy steep stuff, not yet at least.) Do you think that the calipers might break under the load of 8" rotors?
Duc |
| OK, that's a reason to | JimC.
Jan 14, 2004 4:33 PM | | email jimi@magura.com, he'll steer you right. I've not heard of 8" or 205, or even 190mm rotors on Marta, better check with the good guys.
Good luck, Jim (190# plus 20lb of gear on Bullit riding the Norshore in BC, a different matter than yours) C |
| OK, that's a reason to | duc135
Jan 14, 2004 8:14 PM | | Thanks Jim! I'll give him a holler. |
| Sounds like the '04 Louise FR 180/160 would be plenty powerful... | Bikeless Rider
Jan 15, 2004 12:48 AM | | ...if you're only 130 lb. They're only about a 1/4 lb heavier than the Martas and have one piece calipers now. Magura's specs indicate they're about 13% more powerfull than the Martas.
Note: although some are using rotors bigger than 6" on Fox forks, it voids the Fox warranty. |
| Sounds like the '04 Louise FR 180/160 would be plenty powerful... | duc135
Jan 15, 2004 9:14 AM | | Unfortunately, my frame is setup for an 8" rotor in the rear so I will need to adapt my Marta's or buy an new 8" set. |
| A Billit rear is set for 160mm, or 6" rotor, what are you ... | JimC.
Jan 15, 2004 8:36 PM | | talking about? For a Bullit to take an 8".... (190-208mm rotor) you need an adapter. Your statement makes zero sense to me? Jim |
| A Billit rear is set for 160mm, or 6" rotor, what are you ... | duc135
Jan 15, 2004 10:25 PM | | http://www.santacruzmtb.com/bicycles/bullit/tech.asp
"The burly frame and longer travel rear end have also brought about two other changes: the Bullit can now run a 7 inch travel fork, and comes set up to handle an 8 inch diameter rear disc rotor." |
| Well blow me down... | JimC.
Jan 16, 2004 6:06 AM | | Sorry, I didn't know that, and I've had 2 Bullits. Again, I'd say talk to jimi at marura dot com before you do anything. Good luck! Jim |
| Uhm...... | Pat T.®
Jan 16, 2004 10:18 AM | | That means a 180mm rotor will fit now, they did not fit before... doesn't mean the I/S mounts are moved.... otherwise they wouldn't be I/S mounts anymore. I think he could keep the Marta levers and run Louise FR calipers with the 180mm rotors. |
| Uhm...... | duc135
Jan 16, 2004 3:34 PM | | Correct me if I'm wrong, but everyone keeps mentioning 180 mm rotors. Doesn't that equate to 7" and 8" = 203.2 mm? Also I thought the IS mounting standard was just the spacing between the two bolts. Wouldn't it be the same if they moved them both the same amount to accomodate a larger rotor? I could be wrong, though. I am new to all this.
Duc |
| Uhm...... | paul5s
Jan 16, 2004 4:20 PM | | The IS mounts don't move, you will need an adapter to run 205/203/185/180 discs in the rear these usually come with a brake kit or can be bought on their own. The SC statement isn't clear about this email them to be sure but IS mounts are 51mm IIRC and a fixed position on the dropouts. |
| Uhm...... | duc135
Jan 17, 2004 1:12 AM | | Sorry, didn't mean to imply that the mounts are user moveable. I meant that SC welded them farther up the rear to accomodate the 203 mm rotors.
Duc |
| here's what to do... | JimC.
Jan 17, 2004 4:48 AM | | email Scott Turner at Santa Cruz bikes and ask him to advise of the rotor sizes you can use and how to accommodate them (do you need adapters etc etc).
Take that info and email jimi@magura.dom and see how or if you can adapt the Marta to the rotor size, assuming you have to go bigger?
Good luck, Jim |
| Nope.... | Pat T.®
Jan 18, 2004 12:01 AM | | They are an I/S standard mount, I already went over this. It would be stupid for SC to limit all riders to 8" rotors only, you woud never be able to run a smaller rotor thus cutting out probably 75% of the rotors most people would use on that frame. The rear swingarm is now able to fit an 8" rotor, before they were not. Even if you look on the web site you can see that they are running an adapter to be able to run the larger rotor. The I/S standard isn't only the 51mm spacing for the caliper mount holes on the frame, the front hole on the mount is on a 78.1mm radius, while the rear hole is on a 39.9mm radius. They are just using adapters............ |
| So a 160mm, or 6" Marta fits. Poifect!....thanks Pat (nm) | JimC.
Jan 18, 2004 5:58 AM | | |
| Nope.... | duc135
Jan 19, 2004 11:40 AM | | Pat,
Thanks for the technical clarification. Couldn't see the adapters you were talking about on there website, but I'll take your word for it.
And thank you too, JimC for all your input. I just have one issue though. My messages to jimi@magura.com keeps getting bounced back with an invalid address.
Duc |
| Better late than never... | The Squeaky Wheel
Jan 21, 2004 4:07 PM | | Been trying to spend some time on the new boards (boring, no traffic) and didn't see this post.
Magura has changed their email addresses. They are now magurausa.com not magura.com
try jimi@magurausa.com
I think Pat T & Jim are right. The bigger rotors require an adaptor. And yes. 180mm=7" not 8".
Squeak |
| Now THAT sounds like the right info! I too thought SC meant.... | Bikeless Rider
Jan 19, 2004 11:38 PM | | ...that the swingarm now clears the bigger rotors, rather than the mounts being repositioned, just wouldn't make sense like you said. So I will repeat, at his weight, I think he's best off with the "04 Louise FR 180/160. I'm looking at them too, but Fox voids the !@#$%^&* warranty with anything over 160on there forks, SO YESTERDAY man! |
| Well to be honest.... | Pat T.®
Jan 20, 2004 3:18 PM | | Are you going to tell Fox that you had a 180mm rotor on it? I am all for warranties, but if Fox is going to make a freeride fork then limiting riders to a 160mm rotor is plain stupid IMHO, I think Marzocchi voids the warranty too..... but everyone I know runs 180mm or larger. |
| That's a tough call Pat, if I were to use a 180 rotor, or a 10mm | Bikeless Rider
Jan 20, 2004 9:02 PM | | ...spacer mod (as some have done), I'd certainly make sure it was done right, and removed if I ever did have to send the fork in to Fox. Then again, that's gotta leave you wondering if they use some sort of methods to determine if unauthorized mods have been used, and consiser the consumer is a liar rather than just ignorant. I'm for warranties too, but ones that are reasonable and make sense, not ones based on alot of what if scenarios and 1 in 1000 chance happenings. This kind of thing has me wondering if even a simple brake tab facing voids the warranty.
One thing I don't agree with you on is that Fox has made any true "freeride fork" yet. My opinion is the same as that of Charles Coker, that they need to take the freeride crowd more seriously and offer something in that niche of the sport. The ironic thing is, the guy I spoke to at Fox just the other day said the reason they don't allow 180s on their forks was due to stress on the retainers on the dropouts that keep the wheel from slipping out. If that's all it is, they could just beef up the dropout retainers and make even their existing line of forks 180 compatable. |
| That's a tough call Pat, if I were to use a 180 rotor, or a 10mm | The Squeaky Wheel
Jan 21, 2004 4:09 PM | | No adaptor needed for the 180mm front rotor with Louise FR. The caliper is "oversized" to accomodate the 180mm front. In fact, you couldn't run a smaller front rotor with Louise FR. The rear is designed around 160 and Magura supplies an adaptor to accomodate the 180.
But I don't think 180 in the rear is necessary for aggressive trailriding and I find a 160 to work just fine.
Squeak |
| Small clarification | Pat T.®
Jan 21, 2004 5:29 PM | | Actually the caliper on the front is just a rear.... remember 180mm front equals a 160mm rear, or if you put a 160mm front caliper on the rear you would have to run a 140mm rotor. Yea a 160mm rear is good for me too, especially with the Gustav... no problems locking the rear. Though I am going to bolt up a 210/190 combo just for fun. |
| Correct as usual.... | The Squeaky Wheel
Jan 21, 2004 5:38 PM | | You got that right Pat. The front Louise FR is just a rear caliper spun around to fit on the front IS tab.
210/190 sounds like fun.
Squeak |
| LOL...... | Pat T.®
Jan 22, 2004 8:04 AM | | I know it will be an OTB once or twice for me though LOL |
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