MikeWarner Posted June 20, 2009 Report Share Posted June 20, 2009 Hi - I'm building my new bike up and wondered if it is worth having larger discs? There is about a 60gram penalty for doing so. Do you need 180mm on a trials bike? Quote Link to comment Share on other sites More sharing options...
Captain Scarlet Posted June 20, 2009 Report Share Posted June 20, 2009 60 grams is such a negligible amount, so I wouldn't chose a rotor over a weight benefit.It is common to have a minimum of a 180mm rotor on a 26" (which is what I assume your building).I run 160mm's on my 20" (the rotor size is for better clearance against obstacles), a larger rotor has more surface area and therefore more stopping power. Quote Link to comment Share on other sites More sharing options...
weirdoku Posted June 20, 2009 Report Share Posted June 20, 2009 If you want more stopping power than yeah larger discs over smaller ones, I run a 185mm on my mod, front and its insane!Larger discs cost more I believe and they are heavier as you said, if you're not bothered by both of them and just want more stopping power then larger (180mm onwards) is your choice. Quote Link to comment Share on other sites More sharing options...
Herr.Wolfkatze Posted June 20, 2009 Report Share Posted June 20, 2009 60 grams is such a negligible amount, so I wouldn't chose a rotor over a weight benefit.It is common to have a minimum of a 180mm rotor on a 26" (which is what I assume your building).I run 160mm's on my 20" (the rotor size is for better clearance against obstacles), a larger rotor has more surface area and therefore more stopping power.If you want more stopping power than yeah larger discs over smaller ones, I run a 185mm on my mod, front and its insane!Larger discs cost more I believe and they are heavier as you said, if you're not bothered by both of them and just want more stopping power then larger (180mm onwards) is your choice.Larger discs don't boost stopping power a whole bunch more than anything that could simply be controlled from the brake levers... The rotor size is all to do with cooling, bigger bike = more speed = bigger rotors to self-clean and cool under high speed stopping so your pads don't get cheese grated.Could be wrong but that's what I always gathered. Surely it would be bigger pads to boost stopping power anyway..? Quote Link to comment Share on other sites More sharing options...
Ali C Posted June 20, 2009 Report Share Posted June 20, 2009 the bigger the rotor the more leverage you have. Imagine stopping the wheel with your hand on the hub (hard) or your hand on the rim (easy), its exactly the same with disk rotors.PS, I would lever go under 180mm on a stock Quote Link to comment Share on other sites More sharing options...
Herr.Wolfkatze Posted June 20, 2009 Report Share Posted June 20, 2009 the bigger the rotor the more leverage you have. Imagine stopping the wheel with your hand on the hub (hard) or your hand on the rim (easy), its exactly the same with disk rotors.PS, I would lever go under 180mm on a stockAah~ Nicely broken down Quote Link to comment Share on other sites More sharing options...
Scott Gibbs Posted June 20, 2009 Report Share Posted June 20, 2009 As ali c said bigger discs give more leverage, 160mm is a wee bit too small for stock/24 but is fine for mods, 180mm seems to be the choice of most riders. 203mm gives good leverage but maybe a bit too much unless your a heavy rider. Hayes are now producing a whopping 220 rotor kit now! Quote Link to comment Share on other sites More sharing options...
MikeWarner Posted June 20, 2009 Author Report Share Posted June 20, 2009 Cool. I understand why bigger ones stop better, but just wondered if 160mm would be up to the job. Looks like I'll go with 180mm then. Cheers for all the replies. Quote Link to comment Share on other sites More sharing options...
JonMack Posted June 20, 2009 Report Share Posted June 20, 2009 160mm also looks a bit funny on stock Quote Link to comment Share on other sites More sharing options...
Muel Posted June 20, 2009 Report Share Posted June 20, 2009 I've got a 180mm Mono Trial on mine, it's a bit lacking if I'm honest but it does the job.I'd never use a 160, they're just not powerful enough on a stock. Quote Link to comment Share on other sites More sharing options...
MikeWarner Posted June 20, 2009 Author Report Share Posted June 20, 2009 Mine is also a Mono Mini. I'll deffo grab a 180mm. I have new genuine Hope pads on there, so they should be ok. I think I may already have an ISO to ISO +20mm mount somewhere already too. Quote Link to comment Share on other sites More sharing options...
ogre Posted June 20, 2009 Report Share Posted June 20, 2009 i'm a dual disc basher 200/203mm on the rear for stocks 160-180 for mods. 160-180 for the front of either, depends on how fat you are, or how shallow your ego is... Quote Link to comment Share on other sites More sharing options...
Ben John-Hynes Posted June 21, 2009 Report Share Posted June 21, 2009 I've just gone from a 185mm BB7 to a 203. And the difference isn't massive, whether it's because it hasn't fully bedded in yet I don't know, but my 185 was more than enough. Quote Link to comment Share on other sites More sharing options...
J Trials 31 Posted June 21, 2009 Report Share Posted June 21, 2009 I run a 180mm Hope on the front of my A3. Has a really nice feel. Quote Link to comment Share on other sites More sharing options...
ogre Posted June 21, 2009 Report Share Posted June 21, 2009 I've just gone from a 185mm BB7 to a 203. And the difference isn't massive, whether it's because it hasn't fully bedded in yet I don't know, but my 185 was more than enough.on the front it wont take much different, esp with cable (the cleaner the cable line the more win your brake...) Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted June 21, 2009 Report Share Posted June 21, 2009 Ive got a 203 bb7 on the front of my stock, just for the assurance that it WILL stop anything Before that i used it on the mod Quote Link to comment Share on other sites More sharing options...
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