DownhillingKing Posted February 2, 2010 Share I'm running a 203mm disc front and back but the other day in tokai I met with another DHer who was running little 138mm discs does that not decrease your braking power by quiet alot?? Link to comment Share on other sites More sharing options...
dirtrider Posted February 2, 2010 Share I suppose it all depend on the riders weight and how much you like to use your brakes . But it does increase your braking power . Link to comment Share on other sites More sharing options...
techguy Posted February 2, 2010 Share 140mm discs are meant for XC racers who are hung up on weight, they (in my opinion) are more weight than good cuz they don't brake very well, so (again my opinion) I'd rather ride without brakes than 140mm rotors. I run a 180mm in front and a 160mm at the back, and I'm not a big rider 63kgs but I find I can generally out brake most into the corners... Link to comment Share on other sites More sharing options...
AndreZA Posted February 2, 2010 Share That 138 is actually 140mm. Can't see why he is using it. DH/FR bikes are not for weight weenies. I ride a 140 disc on my rear wheel and I can not feel any difference riding XC. Link to comment Share on other sites More sharing options...
Capricorn Posted February 2, 2010 Share 203 up front, 185 rear. For DH, small disc at the back is nice cos there is less braking, a pseudo modulation if you like. So you roll just a little bit more than with a larger disc. Nice if you just want to spool off some speed without locking up. Link to comment Share on other sites More sharing options...
Thumper Posted February 2, 2010 Share 203 at the front with 180 at the back. Dont think there is that much weight to be saved from running smaller rotors. Link to comment Share on other sites More sharing options...
parabola Posted February 2, 2010 Share I used to have a 180 up front and that definitely gave me more braking power, but I now run 160's all round as I find the larger rotors harder to keep true. I can see some practical benefit in running a small rotor at the back as Capricorn says it allows you to just shrug off some speed and not lock up, but this obviously depends on your riding style. Link to comment Share on other sites More sharing options...
Bos Posted February 2, 2010 Share 180 front and 160 back, keeps a bit cooler aswell. as much a image thing as a practical thing, but it does make a difference. Link to comment Share on other sites More sharing options...
nickc Posted February 2, 2010 Share 185 Front - 160 Rear. Link to comment Share on other sites More sharing options...
AndreZA Posted February 2, 2010 Share 203 at the front with 180 at the back. Dont think there is that much weight to be saved from running smaller rotors.?    You do. It's quite a bit if you are into that kind of thing. 160mm XT 6-bolt to 160mm Aligator 6-bolt saved 30 grams. 140mm Tektro 6-bolt to 140mm Aligator saved just over 60 grams. Link to comment Share on other sites More sharing options...
Mudsimus Posted February 2, 2010 Share 160's on bike and 560's on the other. Link to comment Share on other sites More sharing options...
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