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Thread: Single front rotor on some 750s .. ??? Reply to Thread
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  Topic Review (Newest First)
Jun 13th, 2019 9:15 pm
belter i find the dual discs are more a want than need personally for the slower things. my m600 with the single never had the big bite that i like so much, but it wasn't a technical issue as such.

as an aside, i find that the bikes that typically have the most front disc wear are our learner monster 659 (destroked 696). even with dual front discs, the young guys are either hard on the throttle or hard on the brakes. i've seen a few with undersize discs at 24,000km.
Jun 13th, 2019 6:55 pm
ducvet Keep in mind different parts of the world saw different spec bikes so I hate to say something has never been done, safer to say to the best of my knowledge IN MY COUNTRY. I have been bitten by the difference more than once on here when I forget this is a world wide forum.

Carby 750SS had a single disc in the USA and I use it just this way on the track to instruct. Plenty of brake for a bike this weight and power if you maximize what you have. better pads and braided lines are a minimum. I like the fact a single disc front end is a good 5lbs lighter than a dual disc and it is all unsprung weight right off your front wheel. I did find at a certain power level it gets harder to get away with it on the track but for street use I have ridden many worse dual disc setups such as oem gsxr1000 w/tokico calipers , yamaha R1 first gen . These setups can be made better obviously but as delivered a dual setup is not necessarily better.

The 750ssie in the US did have duals but the sport was a single, I find the riders preference is what we are talking about as the majority will not come close to needing all of what the single gives let alone duals. The feel and confidence are the big gain with duals, much like over tiring a bike for a slow rider may make them faster as it boosts confidence rather than gives added traction. most of what we need is between our ears so what ever works for you , great!
Jun 13th, 2019 3:40 pm
Originally Posted by amullo View Post
Depends on the 750.

The 750 Sport got a single disc, steel rear swingarm and non adjustable forks (other then preload as I recall)
The 750 SSie got dual discs, aluminium rear swingarm and adjustable suspension.

It was the same with the 600 and the 620.

But it also depends on the years.
No 750SSie’s had an alu swingarm or adjustable suspension, they all had a steel swingarm and non-adjustable forks. The 750SSie has the full Brembo Goldline brakesystem as the 900SSie including two front discs.

The 750 Sport had matt black paint and was missing the full Brembo Goldline brake setup as on the 900SSie. And one front disc.
Jun 13th, 2019 8:57 am
duc96cr I have an 85 Sportster. The frame is much stiffer than the older Sportsters resulting in a decent handling bike , considering the weight.
Jun 13th, 2019 7:11 am
Rex Coil 7 ... most fun I ever had on a street bike was on this one. 1984 Harley XLX61 1000cc. Weighed 540 pounds wet, 55HP, 4 speeds, solid lifters, single piston caliper on single front disc, and I could ride the piss out of it and rarely get in over my head. Absolutely adored that bike, and have regretted selling it for over thirty years.

I'm hoping to have that same experience with the 1996 900CR I bought a week ago!!

(I've had 1990s 4cyl Jap bikes ... one of which was a five valve Yamaha ... totally not impressed ... like riding a damned sewing machine)

... jist sayin' ...

Jun 13th, 2019 3:22 am
belter it made them cheaper, so more price differentiation in the showroom.

when they introduced the 600ss the 750ss got twin front discs to separate those two.
Jun 13th, 2019 2:39 am
ifly65 I added mine with all OEM vintage parts. It is NIGHT and DAY from a single front disc brake. I drove it both ways. I don't care about the weight...it feels much safer. I guess I compare it to nearly all the other bikes Ive owned, which had duals.

Yes my Ducati books say that it was a cost cutting measure.
Jun 13th, 2019 2:17 am
amullo Depends on the 750.

The 750 Sport got a single disc, steel rear swingarm and non adjustable forks (other then preload as I recall)
The 750 SSie got dual discs, aluminium rear swingarm and adjustable suspension.

It was the same with the 600 and the 620.

But it also depends on the years.
Jun 13th, 2019 1:56 am
Rex Coil 7
Single front rotor on some 750s .. ???

It seems like some of the 750 SS models had a single front disc brake.

This got me looking at some of the specs, comparing the 750 with the 900. Both seem to weigh almost the same (close enough to call them equal). The 750 specs say it's good for roughly 125mph top speed.

So the 750 and 900 weigh the same, and the 750 has a respectable top speed.

That having been said, why does the 750 have a single front disc, and the 900 have dual front discs? It would seem that if one disc is good enough to haul down a 400 pound motorcycle (the 750) it would be good enough to haul down another 400 pound motorcycle (the 900).

Was it just about marketing? Or was the 750 supposed to be an economy bike (hence fewer parts, meaning front brakes)? Or what? I'm just attempting to learn up on these motorcycles.


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