heres a before n after of what i did to my bike yesterday

BEFORE


AFTER

Yes, all things being equal.

But you forgot that the profile height also contributes to how sharp the the tyre can be.

Most 140 tyre are 70 height, while 150 tyre are 60. , unless you ride and ADV with 150/70 profile tyres. As with anything, this is just generalization as manufacturer can make the profile as flat or as steep as they want for any given profile.

Another reason why some switch to 140 from 150 is 150 section tyres were actually more rare and expensive a few years ago. The 140s are more common as they are usually used on 250cc bikes. The 400cc class that uses the 150 section tyres only burst out in popularity maybe 5 years ago.

On that note, the Ninja 250 has the same rim sizes and frame design as the 400, with a small weight difference (5kg~) but is fitted with 140/70/17 rear.

Wouldn't that imply that the 140 should also be a good choice for the Ninja 400?

Besides that, I was checking whether the Corsa S123 is radial or cross-ply... it seems like it's a cross-ply tyre?

I have been running that with a front Dunlop Sportmax GPR-300 which is a radial tyre, interesting that the construction mismatch didn't cause any issues... despite me bringing it up to 170km/h for a couple of times.

the S99 is ok as long as you like it
speed rating is H, vs the S on the GPR-300, and that's ok

S123 is definitely cross ply - see tyre code, 140/70R17, with the 'R' before '17' means radial, without it means cross-ply
there's a price gap between cross ply and radial

some cross ply I know even comes with dual compound, such as the Maxxis Volans, maybe there are new models with dual compound now

Feeling grateful that nothing happened to me with a front radial and back cross-ply for more than a year...

Anyway, I went for the cheapest medium soft tyres I could get as I wasn't sure if I would change my bike in the near future.

If I am still with my bike the next tyre change, most likely gonna do Maxxis S98 (F1) front and Maxxis Extramaxx rear... somehow they happened to have matching tread designs.

For some reason I am also starting to care a lot about tread designs on a tyre, which is why I don't like the Road 6 even though they are the best road tyres... strange how things have changed.

I mix my tyres
some ppl won't

you prefer a full sipe, vs a closed tread?

my rear tyre wears out twice as fast as the front, or sometimes 3 rear 2 front
so, I order my tires off shopee, depending on price
naturally, I don't always have a matching set

Metzeler Roadtec01 set
Pilot GP set
Pilot GP mix Racetec RR rear
Pilot GP mix Road5 rear
M9RR mix Road5 rear

getting too technical is no fun, and I am like that
I'm learning to ride and grasp how tyre responds to my input, which I am not good at before this
I dare not push the front with the brakes, scared, so usually just hard on the throttle, and I have once or maybe twice slid the rear just a bit

Not much discussion, because I feel most ppl kena kecam if they mix their tyres. so, usually, just keep quiet - some more I'm mixing brands

I don't encourage ppl to mix tyres, I do it out of curiosity
If anything, I would try Power5 front + Road5 rear

- I could find Road 5 rear on bargain, so I bought 2. Didn't find any fronts.
- I found M9RR on bargain, but before I pasang, the Racetec RR finished until wire showing

I'm hoping, the Road5 finishes fast enough, then I pasang the 2nd one, and then change front and back together. This is probably 20k later. I doubt the M9RR will last that long, maybe 13k~15k at most. I finished the Roadtec01 front in 12k iinm. So, now I'm hanging with the M9RR+Road5 combo. Which is ok, because the M9RR is sports with a little bit of touring DNA to it and the Road5 is a touring with sports DNA on the shoulder compound.

After I'm done with this, I think I'll go back to being 'normal'

if fun factor is big for you, for riding a motorcycle, I would say try not to think about saving money with tyres. if anything happens, saving money on tyres is not worth it

usually, losing the front, you get a lowside; losing the rear, also lowside, but there's a chance the rear recovers and then becomes a highside - thinking along this line, the rear is very important

Since you're on a 400, which is a 110/120 + 140/150 combo, I'd say the tyre cost is not as high. Just go Radial next time, and really enjoy the ride.
I've recently seen a few dudes using Rosso Sport (cross ply) on a 250, and no chicken strips on the front. He is that good.

if fun factor is big for you, for riding a motorcycle, I would say try not to think about saving money with tyres. if anything happens, saving money on tyres is not worth it

got a few things done the past few days.

At Chan Bikers in Sek 15 shah alam

Wow, didn't know those L shaped valves existed... Too bad it'd probably mess with tyre balance.

Do you know if Chan Bikers will do lighter work like changing out the air filter, coolant/brake oil replacement? Need to do my 12k km service soon.

how about rain wise with mixed tyre?

Agree, I think my riding experience has improved a lot after changing out my tyres, you just feel much more confident in the corner and with your bike overall.

I put on the S123 not knowing there were better choices in the market for just a little more, and I never thought that I would want to push the limit of my bike. When I first started, I was so sure that I would only be riding the bike very conservatively. I guess you do change as you get more experienced in riding.

Just one of many lessons I wished I learned on a moped instead on a big bike, then I would have saved myself some money.

Wow, didn't know those L shaped valves existed... Too bad it'd probably mess with tyre balance.