200mm existing rotors to 180 or 203 please??

203 is just 1.5mm spacer/washer between the bracket/mount and it's all good.

Easy - don't get coloured rotors : )

203 is a stupid size that should be killed off. But as above, a washer or 2 will do it.

What do you mean 'thin enough'?

If you drop down to 180 then you will have less braking power as the braking surface is smaller.

As said above, why bother with colour? It is a functional part of the bike that you don't see whilst riding (and if you have time to oggle at your stationery bike you aren't riding enough!).

Aware everyone has their own preferences and all that, but I suspect I may not be understanding your question about 'thin enough'...

My first pair of new rotors, yes Orange, yes I’m an old tart, were Hope. They are 2.3 mm wide/thick and when my LBS tried to fit them, they rubbed on the frame (stock SRAM Centreline are 1.7ish and tight as)

So, am I to assume it’s just a case of adding any old washer that adjusts the gap.

If you're relying on 0.6mm difference in thickness to clear or interfere with the frame, you are asking the wrong question.

They are 2.3 mm wide/thick and when my LBS tried to fit them, they rubbed on the frame

Is that the floating centre part?

2.3 sounds thick, as I understand it magura rotors are unusually thick at 2.2mm (happy to be corrected) and I thought 1.7 was below wear limit for most rotors to be honest. (quick Google suggests centre line were 1.85 until a few years ago now 2mm and wear limit is 0.3mm)

If you’re relying on 0.6mm difference in thickness to clear or interfere with the frame, you are asking the wrong question

Absolutely this.

If this is for the rear, 20mm smaller than the front is quite common and can help balance out the feel.

The front does most of your braking and a smaller rotor may reduce the risk of frame rub.

What size is up front?

I’m assuming that it’s the rear that you’re having clearance issues with? If so it sounds like it’s the diameter that’s the problem and the frame is probably designed for a 180 maximum? You certainly need some clearance or otherwise apart from an out of true rotor damaging the frame, fitting the wheel will be difficult too. Hope this helps!

They are 2.3 mm wide/thick

The braking track on the floating rotors isn't 2.3mm.
It's 1.8mm.
The 2.3mm rotors are the Ebike/HD rotors and are not of the floating design.

220mm

It’s designed for a 200mm, and currently has one fitted.

220mm

It’s designed for a 200mm, and currently has one fitted.

So it's a 220mm won't fit on the frame currently mounting a 200mm?

Yeah thickness is not the problem and has likely just saved you a very expensive sheepish face when it ate through the seat/chain stay.

Either give up on orange or fit 180s.
Neither size is more difficult than the other but will need a new/no adapter assuming the rear isn't 200mm post mount native.

You will need to brake harder for the same effect with a 180 rotor. It is more likely to over heat on long descents (and short if like me, you love your coward levers.)

It's likely to look a lot better in 200mm not orange, need the same braking and no additional adapters.

Your lbs should be able to tell you all of this though including "hell no to the 220" and "really not orange".

(stock SRAM Centreline are 1.7ish and tight as)

Having just realised you mean stock on the bike, not centre line from lbs stock, this also sounds bad/wrong. Do you have a photo?

https://www.uberbikecomponents.com/category/480/Disc-Brake-Rotors

Uberbike appear to sell two different styles of rotors available in orange and 203mm…

Edit. Reread the op. Am confused. Are we saying that there is a 200 rotor there and you want to fit a 220?

The 220 is on the front (somebody asked) I have photos, but don’t have a clue how to put them on here.
All I’m trying to do is replace a 200 on the rear, but can’t get one in orange, hence 203 or 180

Comes in 180mm - https://www.uberbikecomponents.com/view-product/Uberbike-Radiator-Floating-Disc-Brake-Rotor-with-Heat-Dissipation-Alloy-Fins-Orange-Black - assuming you have 6-bolt rotor hubs (takes 6 bolts to fit rotor to hub).

Comes in 180mm - https://www.uberbikecomponents.com/view-product/Uberbike-Flatout-XL-Disc-Brake-Rotor-Orange

They both also come in 203mm, but if the rear has a maximum of 200mm rotor size then I'd be wary to go 203...it does mean things are closer to rubbing bits that should be rubbed.

but don’t have a clue how to put them on here.

For example

Upload to postimages.Org
click share
Copy "direct link"
Click img up there ^^^
Delete the http:// from the popup box
Paste in the link
Click ok

Voila.

The simple (and correct) solution is definitely stick with the 200mm centreline front and rear.
Coloured rotors are like novelty ties.

Don't fit a 180 if you already have a 200/203. The front might be the more powerful brake but the back still does a lot of work and does it more often, so that big rotor (especially on an ebike) is well worth having

It’s like someone up above is sending you a message not to be a tart - and definitely not to fit orange rotors to your bike as they are an abomination

if you can get a thicker rotor why not just shave a little (0.6mm) material off the rotor where it meets the hub, to shift the rotor back over a little away from the frame? that way you get the benefits of the thicker rotor, the same strength as the thinner rotor, and orange.

if you can get a thicker rotor why not just shave a little (0.6mm) material off the rotor where it meets the hub, to shift the rotor back over a little away from the frame? that way you get the benefits of the thicker rotor, the same strength as the thinner rotor, and orange.

Just grind the mounting on the hub down surely?

if you can get a thicker rotor why not just shave a little (0.6mm) material off the rotor where it meets the hub,

I suspect accurately machining 0.6mm off a rotor centre would be a little beyond the OP given the original question! (edit - or the hub flange)

I still maintain the issue lies elsewhere if there's that little clearance between the frame and the max specified rotor size.

Having gone through a set of Hope floating rotors on my own Levo, quite a bit quicker than on a normal MTB, I’d recommend the thicker ebike Hope ones. I went from 203 all round to 220 front, 200 rear. They feel like they work better in every way.

Sorry about the lack of bling but massive discs look pretty cool anyway.

(edit – or the hub flange)

Sorry, I forgot sarcasm is a little beyond typing on the internet.

Hope this succeeds. Here before you: Cobalt/Orange Specialized Turbo Levo, utter tartery, I agree, but it’s my thing, so hwy-ho.
Front is a Hope 2.3mm 220mm rotor. Rear, same but 200mm (same width was stock SRAM, but slightly wider) just rubbed on the frame.
All I’m looking to do is replace the rear rotor with an orange one. Uberbike do them, but they’re 203mm not 200mm.
That’s my task. I know all about the “muppetry” etc involved in my decisions, but there it is.

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What is the rotor rubbing on? The frame or the brake caliper?

I’d just stick a 180 on I think. That rear rotor looks too big to me. Looks like there’s an adapter you can remove to take it down to 180 so job jobbed

Where is the thicker rotor rubbing? There are no crazy kinks in those tubes and there really should be a favourable amount of clearance between the face of the rotor and the frame. They get flexed, dinged and covered in mud and half a mm isn't a bumping lot to accommodate that.

Nice looking bike BTW, (also a tart but not orange or indeed rotors. At least you've not done the frame bolts or oil slick 😉)

The orange does a good job of distracting from the saddle, good tactics

How did 203 ever become a thing.... everything else disc wise is in 10mm increments. Did someone at Mountain Bike Standards Towers have a bad day?

Front is a Hope 2.3mm 220mm rotor

I'm really not sure Hope make any 2.3 floating rotors. The 2.3 is a solid rotor, all the floaters are 1.8 except the vented which is 3mm.

Where is the rear floater rubbing? Is it the rivets on the brake mounts/adaptor?

It’s been said already, but the Hope floating rotors aren’t 2.3mm thick, they’re 1.8mm. You can only get 2.3mm thick in the standard 1 piece.

How did 203 ever become a thing…

8 inches. ‘Muricans innit.

This is taken from the hopetech page and the advert for the discs I bought:

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The 2.3mm is for the heavy duty rotor and it only comes in silver - https://www.hopetech.com/products/brakes/discs-accessories/heavy-duty-23mm-rotor/

Or the standard and floating disc appears to have the option and the floating option does colour in a 200mm option -
https://www.hopetech.com/products/brakes/discs-accessories/standard-and-floating-rotors/

So looks like you call Hope and order up a 200mm 2.3mm thick floating rotor in orange.

Not sure what is catching but Specialized spec 200mm rotor on the rear with SRAM brakes and 203mm on the rear with Magura brakes on the Turbo Levo. We have both. The Magura rotor is thicker than the SRAM.
Just be aware that the Hope orange is a different colour than the Uberbike orange and will still look like miss matched rotors

So looks like you call Hope and order up a 200mm 2.3mm thick floating rotor in orange.

the 2.3mm rotors are £5 cheaper in all sizes. I’d assume it’s not a floating rotor. Not the easiest to understand site

An orange rotor made by anyone else won’t match in either colour or shape.

Whenever I’ve heard of Hope discs rubbing it’s usually the rivets on the brake adaptors. I can’t see how it could be the braking surface unless there’s a bigger problem behind that.

I can’t see how it could be the braking surface unless there’s a bigger problem behind that.

Point has been made a couple of times, but OP doesn't seem concerned about it.

A can of orange spray paint and some masking tape?

Remember about the speed sensor on the rear due to the thicker disk flange you may need to
Modify, emtb forum would have the answer.

How did 203 ever become a thing…. everything else disc wise is in 10mm increments. Did someone at Mountain Bike Standards Towers have a bad day?

Imperial innit 8" almost on the button. You probably don't remember the olden days but Hayes were a bit bigger in the earliest days of discs on MTBs and being Mercian they liked to work in imperial units (Avid did too). IIRC at one point 152mm (6") rotors were actually a thing.

Hope have sold both imperial and metric rotors and adaptors and Shimano flog both 200 and 203mm adaptors for their brakes still.

I remember having Shimano brakes with the front using an Avid 203 boxer mount (also used to be a thing) and a Hayes rotor, while the rear was using a hope 200mm (old style 5 arm bulb hub) on my DH bike. I also had an early Kona stab at one point where the rear IS mount had just been copied from a fork and was effectively +20mm by default.

Honestly it's a piece of piss these days relative to 20 off years ago...

So looks like you call Hope and order up a 200mm 2.3mm thick floating rotor in orange.

looks like, yes. But they don’t make 2.3 in floating. Also, they don’t do direct sales, but that’s by the by. Maybe bad description on website but I have an email from Hannah in sales stating as much if anyone needs to see it.

The saddle does a good job of keeping an ancient plumbing system functional almost into septagenarianism.

Have you got the rotor conundrum resolved now?

Hopefully 🤞
They’re on order, and I’ll try and post a photo if I’m successful; if not I’ll scurry back away to whence I came.

Good stuff, hopefully it'll all work nicely.

Thank you 🙏