# Bigger rider with new bike...replace 140mm rear rotor? **URL:** \ **Category:** Equipment\ **Created:** [November 24, 2024, 12:07pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372 "2024-11-24T12:07:22Z")\ **Posts on this page:** 7\ **Page:** 2
**Author:** ![kevistraining](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/kevistraining/32/171237_2.png) [@kevistraining](https://www.trainerroad.com/forum/u/kevistraining)\ **Post date:** [November 26, 2024, 3:30pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/22 "2024-11-26T15:30:07Z")
The reason I asked is because I have 160 rear rotors on my 3T Exploro that I sometimes use for road and when I’m on road tyres I have to be careful not to lock up the rear. ---
**Author:** ![FrankTuna](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/franktuna/32/135629_2.png) [@FrankTuna](https://www.trainerroad.com/forum/u/FrankTuna)\ **Post date:** [November 26, 2024, 4:10pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/23 "2024-11-26T16:10:29Z")
What are you using for rotors to help with the heat issue? I get that going up a size can help but wondering if it’s worth looking beyond the stock Ultegra rotors? I think for my local roads the 140mm will be fine but I have some events on the calendar in the spring that will have some serious descents. Can’t hurt to have a 160 ready to go by then. ---
**Author:** ![scurran](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/scurran/32/90868_2.png) [@scurran](https://www.trainerroad.com/forum/u/scurran)\ **Post date:** [November 26, 2024, 4:44pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/24 "2024-11-26T16:44:24Z")
I was using XTR 140’s (with the fins) at the time, went to Ultegra 160’s, and they warped really bad from heat (those 4 spoke ones), so went with XT’s, and those have been fine. On the XC and Enduro bike I went with Galfer 2.0mm, a little thicker than shimano recommends, but work well for my needs. Also worth noting, im on galfer pads all around now, green I beleive. ---
**Author:** ![AJS914](https://avatars.discourse-cdn.com/v4/letter/a/919ad9/32.png) [@AJS914](https://www.trainerroad.com/forum/u/AJS914)\ **Post date:** [November 26, 2024, 8:19pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/25 "2024-11-26T20:19:55Z")
> [@scurran](#): > > 100% go 160. I love 140mm rotors, but burn them black far too much on big hills. I weigh 220 at 6’4", and with steep sustained 1000+ foot gravel descents But this is a 140, on the rear, on a **road** bike. I’d just ride it as is and when pads/rotors are worn out in the future upgrade to 160mm if necessary. ---
**Author:** ![kasperbp](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/kasperbp/32/120120_2.png) [@kasperbp](https://www.trainerroad.com/forum/u/kasperbp)\ **Post date:** [November 26, 2024, 9:01pm UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/26 "2024-11-26T21:01:07Z")
198 cm / 106 kg here, same bike, same brake setup. No problem at all. Have been throwing it down mountains in Italy, Spain and France, without any issues at all. ---
**Author:** ![ACree](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/acree/32/92159_2.png) [@ACree](https://www.trainerroad.com/forum/u/ACree)\ **Post date:** [November 27, 2024, 6:01am UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/27 "2024-11-27T06:01:39Z")
I am about 15 lbs lighter than you and prefer 160/160 on gravel and road. My 140 rotors would discolor and I wore a few out. That seems to not be an issue with a 160 rear. On gravel in particular I do long climbs/descents, less of that on paved roads. ---
**Author:** ![blister202](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/blister202/32/36023_2.png) [@blister202](https://www.trainerroad.com/forum/u/blister202)\ **Post date:** [November 27, 2024, 6:38am UTC](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372/28 "2024-11-27T06:38:33Z")
I would say keep it. It’s not worth to spend money on rear brake disc size. I bought my bike with 140/140 front and rear. Altough I have no problems so far, will switch to 160 in the front. I am 90kg and riding mostly in the Swiss Hills [Previous page](https://www.trainerroad.com/forum/t/bigger-rider-with-new-bike-replace-140mm-rear-rotor/98372.md?page=1)