regata / ritmo / strada, all the same platform / mechanicals (basically) they are a Fiat 138 chassis / model designation, available in sohc/dohc/OHC 1600,/diesel variants.
Certain models used 257mm solid discs up front, 100s regata (1600 dohc engine) ritmo 105 (a ritmo is basically a regata hatch if you like) ritmo 125 all used this same setup, pad is larger than the regualr "DB29 - which is the Bendix reference - seeing as they ae Bendix made brakes.... shape the usual Fiat uses.
Rear of the race car is 257 solid, willwoods (but much smaller piston) and uses the exact same adaptor bracket, just without the spacer under the disc hat. Brakes on the race car are like ths as it's being built to go lemons racing, and has to last 24 hours of abuse...
Greg, Hot setup for your road registered street car would be (and given the reduced weight of your car I would be hesitant to laod the car with very heavy discs that are unsprung weight)
257 x 12 discs up front, regata 100 calipers / carriers and pads of a decent compount, if you look around I think you'll find you can get right up to the equivalent of DS11 compound material
227 x 11 on the back, using 38mm piston rear calipers from 132/125, use a front caliper carrier (the cast iron bracket) from a regata 85s (manual), as this lets you use a larger pad shape (it's the same as lancia beta rear will work on the back)
much more consistant brakes, slightly more rear bias than stock.... cheap enough for the discs to replace them often if they ever get too hot, and very little increase in sprung weight mass
If you really wanted 257 solids on the back and you MUST have a hand brake, then you could use the 100s front calper CARRIERS that will bolt to the rear hub, and then use rear calipers from alfa 164 / fiat croma / lancia thema like one of these, they are 36mm piston (like a lancia beta rear, whuich will also fit an x19)
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https://www.ebay.it/itm/PINZA-FRENO...572419?hash=item35eadc4b43:g:lX8AAMXQsoNRhfu~)
240mm discs don't give much increase in the way of brake torque, the differnce in the radius centreline of the pads when mounted is so minimal... and if you're not complaining about fading and cooking the fronts, then going to vented discs is simply adding mass for no good reason. The 257mm discs howver ... well thats enough of a %age difference in the radius of the pad centreline , plus with the bigger pad....
wilwoods will have a bigger pad, but also more piston area, which equates to pedal travel issues with the stock master cylinder setup... I also run a willwood pedal box / and seperate circuit master cylinders which is bias adjustable on the fly.... but I don't have to pass any road legality engineering requirements, your car is road registered and it does.... every component would need to have engineering approval / certification.
Jeff, they fit virtually everything Fiat made 1985 - 1999 when fitted with engines over about 80hp, they kept the "usual" one piece sliding wedge design caliper for many smaller engined models ... but the larger cars got Girling brakes (most made under licence) for 48mm size the caliper is 791365 and 791366 , they also come as 52mm and 54mm and look pretty much the same.
View attachment 36385
the reason that this is technically a far superior brake setup lies in the fact, and it is fact, that if you have the caliper fixed (in high performance situations) then usually you would set the disc up to be "floating" or self centering. The reason is "knock off" of the pads due to float / movement of the hub on it's bearings. Toodling around at pedestrian road speeds is hardly a test for brakes, and in that use, a fixed disc / fixed caliper could work perfectly adequately...but when pushed hard, the system will find it's limit
If the disc is fixed (i.e. bolted firm to the hub) then the calper is floating, i.e. able to self centre on the disc.
Look at almost every modern braking system and that's how it is.
Now the sliding wedge that Fiat used does a good job for it's cost, but it is right down at the economy end of the scale of what's available as production parts off the shelf, Fiat saved that for the low perfomance end of their range... the system would have been adequate, and in ways was ground breaking when introduced on the 1100 range back in 1966 on the 1100R, slightly upgraded and used on the Fiat 125 and Fiat 124 sedans in 1967/68... but again the biggest problem is actualy just simple deflection that makes the pedal feel soft / inadequate/ travel. To prove my point take a wheel off the car, have someone else press the brake pedal as hard as they can and watch how much the caliper "bends" in it's holder.
The Girling system with the sliding pins, simply has far less delection. The mount / pins / caliper body are all much later design, probably with a ton of CFA testing on computer, it works better and is simple to service, and has kind of become the industry standard as most "mid sized" cars are like this.
SteveC
