ArrieS Posted September 4, 2014 Share Hi Guys I'm new to the world of 29ers and have a query about braking performance. My old 26er hardtail would stop quite nicely with its Deore brakes, even when one finger braking was applied. To get my 29er dualie to stop, with SLX brakes, half as quickly I am needing to apply a considerable amount of extra force to the levers compared to my old bike and one finger braking is definately out of the question. I've fitted new pads, had the brakes bled and the discs cleaned and buffed and the stopping performance is much poorer than what I expect. Am I missing something? Any hints/tips would be appreciated. Link to comment Share on other sites More sharing options...
rouxtjie Posted September 4, 2014 Share Gots nothing to do with wheelsize...check your rotors and mineral oil. If they both pristine, up your rotor size Danger Dassie, ChUkKy and the nerd 3 Link to comment Share on other sites More sharing options...
MrJacques Posted September 4, 2014 Share Bigger wheels need bigger rotors.... what size rotors do you have? If it's 160, try 180, it should help. Also, are you using metal or resin pads? I think the resin pads will have more bite. Link to comment Share on other sites More sharing options...
ChUkKy Posted September 4, 2014 Share No issues on either of mine, got both SLX and XT and both stop the same...I have 180mm rotors in the front and 160 on the back. Stopping wasnt as good with a 160mm rotor up front, check what size you have. Rotor size does make a difference in stopping power. GoLefty!! 1 Link to comment Share on other sites More sharing options...
worriesnot Posted September 4, 2014 Share No issues on either of mine, got both SLX and XT and both stop the same...I have 180mm rotors in the front and 160 on the back. Stopping wasnt as good with a 160mm rotor up front, check what size you have. Rotor size does make a difference in stopping power.Couldn't say it any better than Chukky up here.I have SLX 180 front, 160 back and easy 1 finger braking... ChUkKy 1 Link to comment Share on other sites More sharing options...
Pieter1 Posted September 4, 2014 Share Tires also make a big difference. My Nevagal in the front stopped me much faster than the WTB I have on now. Link to comment Share on other sites More sharing options...
Louzy Posted September 4, 2014 Share its because youre going so much faster on your 29er..... jules1976, bullet77, 2bliss and 9 others 12 Link to comment Share on other sites More sharing options...
MuddyMike Posted September 4, 2014 Share if you have sintered pads then the issue is likley rotors. go 180mm front and 160mm back. Go ICE TEC and you will be amazed.... Link to comment Share on other sites More sharing options...
DJ84 Posted September 4, 2014 Share Bigger wheels need bigger rotors.... what size rotors do you have? If it's 160, try 180, it should help. Also, are you using metal or resin pads? I think the resin pads will have more bite. The rotor size definitely makes a difference,but i fail to understand how the wheel size would make you need to upgrade the rotor size.If both tires have the same amount of grip and the brakes have the same amount of grip, you will need to apply the same amount of pressure to lock the wheels. Link to comment Share on other sites More sharing options...
johanpre44 Posted September 4, 2014 Share I prefer the Shimano Resin Pads, may wear quicker but the braking performance is very good. I'm running 160mm front and back on my 29er. My 26er is also running 160mm front and back, big difference is the pads (old tektro pads on the 26er, which is not nearly as good as the Shimano Resin pads on my 29er) Link to comment Share on other sites More sharing options...
Vangar Posted September 4, 2014 Share SLX brakes with 180mm and 160mm ICE-Tech rotors and pads. Felt spongy at first, bedded them in a bit, now they'll send me over the bars and stop my heart if I'm not carefull. And Maxiss Ardent up front, but that's secondary. Link to comment Share on other sites More sharing options...
JXV Posted September 4, 2014 Share Simple physics...to get same braking force with same finger effort on same brake lever/caliper on a 29er wheel compared to 26 you need proportionally bigger rotors.A 180 will give a fraction more braking on 29er than 160 on 26....in theory.If you upsized rotors for your 29er and braking is worse then something else is wrong.Align disc to calipers, deglaze and bleed PROPERLY....the whole system. RockCoach and MrJacques 2 Link to comment Share on other sites More sharing options...
droo Posted September 4, 2014 Share Make sure your pads are bedded in properly. A few hard stops from a good pace to not quite stopped and you'll notice the difference straight away. ChUkKy 1 Link to comment Share on other sites More sharing options...
Craig Stubbs Posted September 4, 2014 Share its because youre going so much faster on your 29er..... Classic Chirp! JXV 1 Link to comment Share on other sites More sharing options...
dirtypot Posted September 4, 2014 Share A 29er wheel travels further in distance with each rotation of the wheel than a 26er. Therefore a bigger rotor is needed to achieve the same braking force at the same speed.Simple really. JXV 1 Link to comment Share on other sites More sharing options...
Iwan Kemp Posted September 4, 2014 Share All of the above + tres play a big part as well. Grippier tread will offer more bite Link to comment Share on other sites More sharing options...
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