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Upsize Rotors from 160 to 180?

Old 10-05-16, 07:24 AM
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Upsize Rotors from 160 to 180?

I have a 2016 Novara - Safari that came stock with "TRP Spyke mechanical disc brakes" with a 160 rotor front and rear. Since my bike will be rather heavily loaded, I'm concerned about heat dissipation on long descents, and the issues that can come along with that.

I'm considering upping both to a 180 rotor. The "Shimano XT-Saint RT86 Ice-Tech" rotors in 180 look like a good choice. What are your thoughts on this, and where can I get 180 rotors and the necessary caliper mounting adapters for this at a reasonable price?

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Old 10-05-16, 08:58 AM
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I'm running 180mm front and 160mm rear IceTech rotors on my bike, actually. All you will need is the front rotor, and one of these: Shimano F180PP2 brake adapter, which are pretty cheap. Comes with the longer bolts, too. The RT86 rotors aren't cheap, trust me, I know. The 180mm is gonna run you about $40 no matter where you look. As far as I'm concerned, they're worth every penny.

I don't really see a need for a 180mm rear... but if you go that route, you'll use the same brake adapter as the front, so just order two.
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Old 10-05-16, 11:26 AM
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I run a 180/160 mm Avid rotor combo on 2 of my bikes and wouldn't have it any other way. The 20 mm rotor makes a massive difference on braking and depending on your weight and hills your riding, can all but eliminate the need for cooling down your rotors on a nasty downhill section.

Personally I just use cheap rotors myself with metallic brake pads. I find that front rotors are a consumable item on a bike as the tend to get warped/bent after awhile from parking/crashing/falling down... About every 10 to 15k kilometres it's time for a new one. Rear rotors last forever however...
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Old 10-05-16, 11:40 AM
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Originally Posted by DrIsotope
I'm running 180mm front and 160mm rear IceTech rotors on my bike, actually. All you will need is the front rotor, and one of these: Shimano F180PP2 brake adapter, which are pretty cheap. Comes with the longer bolts, too. The RT86 rotors aren't cheap, trust me, I know. The 180mm is gonna run you about $40 no matter where you look. As far as I'm concerned, they're worth every penny.

I don't really see a need for a 180mm rear... but if you go that route, you'll use the same brake adapter as the front, so just order two.
I have the same brakes as the o.p. TRP makes their own adapters and they are very reasonable. I recommend them. Their rotors are also very reasonable and I am using the 180's on a tandem. They should work fine for a single touring bike. $16.00 ea. The adapters are not quite interchangeable! The rear uses a different size adapter for the same size rotor. The front 160 is the same as the rear 140, the front 180 is the rear 160, the front 203 is the rear 180. It may be the reverse of this but the point is to check with someone before ordering. I'm glad I did.

https://www.universalcycles.com/shop...70&category=13

https://www.universalcycles.com/shop...46&category=13
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Old 10-05-16, 12:11 PM
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Originally Posted by SparkyGA
I run a 180/160 mm Avid rotor combo on 2 of my bikes and wouldn't have it any other way. The 20 mm rotor makes a massive difference on braking and depending on your weight and hills your riding, can all but eliminate the need for cooling down your rotors on a nasty downhill section.

Personally I just use cheap rotors myself with metallic brake pads. I find that front rotors are a consumable item on a bike as the tend to get warped/bent after awhile from parking/crashing/falling down... About every 10 to 15k kilometres it's time for a new one. Rear rotors last forever however...
Really? I think maybe a bit of care and some quality would go a long way... I have my original rotors from 16 Years ago when I got my bike, 38,000+Km and they still look like new...
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Old 10-05-16, 02:14 PM
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Originally Posted by Leisesturm
I have the same brakes as the o.p. TRP makes their own adapters and they are very reasonable. I recommend them. Their rotors are also very reasonable and I am using the 180's on a tandem. They should work fine for a single touring bike. $16.00 ea. The adapters are not quite interchangeable! The rear uses a different size adapter for the same size rotor. The front 160 is the same as the rear 140, the front 180 is the rear 160, the front 203 is the rear 180. It may be the reverse of this but the point is to check with someone before ordering. I'm glad I did.

https://www.universalcycles.com/shop...70&category=13

https://www.universalcycles.com/shop...46&category=13
That's great info, and thanks for the links. That makes it a whole lot easier and clearer for me.

Thanks to everyone else for their help here as well.

I'm definitely going with the "Shimano XT-Saint RT86 Ice-Tech" rotors. I'm just not sure yet if I'll gop180/160 or 180/180. Also wondering what would be the best pads to go with on these?
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Old 10-05-16, 02:21 PM
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I like the 2nd set of pads that followed the Original Sram/Avid, made for Koolstop on 'Bicycle Island'..

Use what came with the brakes first , they wont resell for much anyhow.
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Old 10-05-16, 06:29 PM
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TRP doesn't offer a 180mm rear adapter for post mount, only for PM to IS, and the Novara Safari is post mount brakes front and rear. The Shimano F180PP2 will work both front and rear, and costs about half what the TRP adapters do (TRP does offer a 180mm mount for the front.)

Also to the OP-- check to make sure your seatstays will clear a 180mm rotor. Most forks will easily accommodate up to 180mm, but 180mm in the rear is pretty large. I never checked on mine, the 160mm is more than enough rear brake. I'm using organic pads with mine, because as I mentioned in another thread, brake pads are cheap, and IceTech rotors are not.
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Old 10-05-16, 07:02 PM
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Originally Posted by DrIsotope
TRP doesn't offer a 180mm rear adapter for post mount, only for PM to IS, and the Novara Safari is post mount brakes front and rear. The Shimano F180PP2 will work both front and rear, and costs about half what the TRP adapters do (TRP does offer a 180mm mount for the front.)

Also to the OP-- check to make sure your seatstays will clear a 180mm rotor. Most forks will easily accommodate up to 180mm, but 180mm in the rear is pretty large. I never checked on mine, the 160mm is more than enough rear brake. I'm using organic pads with mine, because as I mentioned in another thread, brake pads are cheap, and IceTech rotors are not.
OK, I'm very glad you mentioned that about the rear. There's only about 7-8 mm more space available there, so going larger on the rear is a no go, thanks. The front will be good though.

For pads, these Kool Stop "Aero-Kool Pads" look interesting, but I don't think they're available for my TRP calipers.

https://smile.amazon.com/Kool-Stop-K...ct_top?ie=UTF8
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Old 10-05-16, 07:18 PM
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The Spyre can use any pad that fits the Shimano Deore style caliper, which have the straight tab like this:



It's one of the most ubiquitous pads there is, so you can get it in most every compound, with your choice of backing material, from pretty much every manufacturer. I have never heard a single bad word about the Trucker Co. pads (I'm gonna shout 'em out, they're local to me)-- and you can get them very affordably on eBay: 4 pairs Trucker Co. pads, $26.99
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Old 10-05-16, 07:35 PM
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The pads you would use are the KS-D620 series for Kool Stop. I use Swissstop Brake pads and their's are the "Type 15" series for the Spyke's and Spyre's. They're more readily available at my LBS, but really are great pads IMHO.

On my Kona, I have 180's on front and 160 on the rear. I would be 160/160, but the brake arm on the Spyre was tapping the spokes on front, so had to go to 180. I used a cheap Shimano SLX on the front and the standard TRP on the back, so when I use up the stock pads, I'll upgrade rotors with the new brake pads. They work alright, minor squealing but bedding the pads was easy enough and they stop the bike when I want them too.
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Old 10-06-16, 01:27 AM
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Originally Posted by 36Oly_Rider
On my Kona, I have 180's on front and 160 on the rear. I would be 160/160, but the brake arm on the Spyre was tapping the spokes on front, so had to go to 180.
I hope I don't have the same problem. Because I would much rather have smaller 160mm rotors on the front, especially since im a heavy user on my rear brakes and dont really use my front unless its an emergency stop.
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Old 10-06-16, 02:12 AM
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Originally Posted by azza_333
I hope I don't have the same problem. Because I would much rather have smaller 160mm rotors on the front, especially since im a heavy user on my rear brakes and dont really use my front unless its an emergency stop.
I think it's a common issue across other brands as well. It was a major issue with the Novara - Mazama I bought, and I ended up returning because of it. Then when I got my Safari it started doing it a little, but adjusting the spokes took care of it. You should check your spoke tension and the "dish" of your wheel. Just be sure it's not a simple adjustment issue.
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Old 10-06-16, 02:24 AM
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Originally Posted by AdvXtrm
I think it's a common issue across other brands as well. It was a major issue with the Novara - Mazama I bought, and I ended up returning because of it. Then when I got my Safari it started doing it a little, but adjusting the spokes took care of it. You should check your spoke tension and the "dish" of your wheel. Just be sure it's not a simple adjustment issue.
Im having the wheels professionally built, so it shouldnt be an issue
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Old 10-06-16, 02:28 AM
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Sounds good. What are you getting and from where?
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Old 10-06-16, 02:32 AM
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Originally Posted by azza_333
I hope I don't have the same problem. Because I would much rather have smaller 160mm rotors on the front, especially since I'm a heavy user on my rear brakes and don't really use my front unless its an emergency stop.
If you're using centerlock on the SON 28, the spoke Pitch Circle Diameter (PCD) is 54mm on both sides, the 6-bolt disc is 59mm on the left side and 54mm on the right. The SP PD-8, that I have, is a 6-bolt with a PCD of 58 on the left and 52 on the right. I can't speak for the centerlock model, because the PCD is less than mine, but the 6-bolt model, I'm gonna say theres a chance you will need 180's on the front, however; your rims will be the 32mm Chukkers, compared to mine being the 20mm Cliffhangers, so it could work out, open the gap a bit and be just fine for 160's.
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Old 10-06-16, 02:34 AM
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Originally Posted by AdvXtrm
Sounds good. What are you getting and from where?
- SON28 36h disc brake (6 bolt) front hub, black
- Velocity Chukker rims, 36h, non-machined sidewall, 700c, black
- DT Swiss Alpine III spokes
- DT Swiss Pro lock standard spokes, black brass
- RT-86 160mm rotors
- TRP Spyre Brakes

I guess if it does only just touch I can use rotor 6 bolt spacers.
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Old 10-06-16, 02:35 AM
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Originally Posted by azza_333
I hope I don't have the same problem. Because I would much rather have smaller 160mm rotors on the front, especially since im a heavy user on my rear brakes and dont really use my front unless its an emergency stop.
But why? That goes very much against the established proper braking form in cycling (and everything with wheels really)

I rarely use my rear brake and is really only for emergencies and handling issues.
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Old 10-06-16, 02:43 AM
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Originally Posted by 36Oly_Rider
If you're using centerlock on the SON 28, the spoke Pitch Circle Diameter (PCD) is 54mm on both sides, the 6-bolt disc is 59mm on the left side and 54mm on the right. The SP PD-8, that I have, is a 6-bolt with a PCD of 58 on the left and 52 on the right. I can't speak for the centerlock model, because the PCD is less than mine, but the 6-bolt model, I'm gonna say theres a chance you will need 180's on the front, however; your rims will be the 32mm Chukkers, compared to mine being the 20mm Cliffhangers, so it could work out, open the gap a bit and be just fine for 160's.
Yeah i've ordered the 6 bolt SON28
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Old 10-06-16, 02:54 AM
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Originally Posted by DrIsotope
The Spyre can use any pad that fits the Shimano Deore style caliper, which have the straight tab like this:



It's one of the most ubiquitous pads there is, so you can get it in most every compound, with your choice of backing material, from pretty much every manufacturer. I have never heard a single bad word about the Trucker Co. pads (I'm gonna shout 'em out, they're local to me)-- and you can get them very affordably on eBay: 4 pairs Trucker Co. pads, $26.99
How many miles do you get from those pads?
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Old 10-06-16, 02:54 AM
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Originally Posted by elcruxio
But why? That goes very much against the established proper braking form in cycling (and everything with wheels really)

I rarely use my rear brake and is really only for emergencies and handling issues.
I know the front brake provides better performance, since while brakeing more force get put through the the front wheel, but I just feel more comfortable using my rear brake.
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Old 10-06-16, 03:01 AM
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Originally Posted by azza_333
I know the front brake provides better performance, since while brakeing more force get put through the the front wheel, but I just feel more comfortable using my rear brake.
I had to really try to get my wife to brake with the front as swapping pads all the time got old real quick. Rear braking is worse in every way and it eats pads for breakfast.
Not to mention that while flipping over the bars may have been a thing in the era of Vee brakes (as those things are grabby and have very little modulation) it's actually very hard to do with modern discs. I've never even managed to properly lift my rear tire and since we're talking touring, you need to be really trying hard to flip a fully loaded tourer. Most times the front tire will just skid a little, which also usually isn't a problem as a small skid doesn't equal immediate loss of control. A bigger skid does but you can avoid those.
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Old 10-06-16, 03:02 AM
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Originally Posted by azza_333
- SON28 36h disc brake (6 bolt) front hub, black
- Velocity Chukker rims, 36h, non-machined sidewall, 700c, black
- DT Swiss Alpine III spokes
- DT Swiss Pro lock standard spokes, black brass
- RT-86 160mm rotors
- TRP Spyre Brakes

I guess if it does only just touch I can use rotor 6 bolt spacers.
Who's building them for you?
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Old 10-06-16, 03:07 AM
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Originally Posted by azza_333
Yeah i've ordered the 6 bolt SON28
Yeah, with the 12mm size difference between the rims you chose and mine, might increase the angle of the spokes on the brake side. It just depends. The Spyre's are pretty chunky, but I like them better than the hunk-o-junk hydraulic Elixir 3's on my fat bike.

But 180's on the front isn't that bad and it might be weird to get used to doing it, but practice using the front brakes more for stopping. It took me a good while, but when I got over my fear of flying head over heels over the bars, it really did make a world of difference and I became a lot more confident in judging where I need to start braking and stopping especially going down a hill.
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Old 10-06-16, 07:50 AM
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Originally Posted by AdvXtrm
How many miles do you get from those pads?
5,000+ out of the front, and I think the rear pair has to be near 10,000. But I primarily use the front brake, and the rear is only for coming to a stop at an intersection, or as a drag brake to bleed off small amounts of speed while descending. Again, the beauty of organic pads-- me rear rotor's thickness has only decreased 0.1mm over 15,000+ miles.
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