Disc brakes

What would it take to install disc brakes on a Bajaj? For instance, could the entire front fork/fender section be switched with a Stella front end? Extreme answers welcome.

Ah, this is something I have been contemplating. I compared the front suspension with that of a PX to see the similarities. I mostly wanted to see if I could put on a Grimeca semi-hydraulic kit for a P-series. The are alot of differences, so I dont know if that would work without swapping out the fork. Now the question is whether the frame can accept a P-series fork? More research is in order Wink

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-Paul O.

75 Vespa Primavera "Parmakit 130", P200E,

I'm also interested in this, but haven't explored it all that carefully. My initial thinking is that the P fork will be shorter than the Bajaj one, but I haven't measured. We know a bajaj one will go into a VBB with some work from that Scoot! article.

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Mad Toto Scooter Club
www.madtoto.com

	Angry J wrote:
	I'm also interested in this, but haven't explored it all that carefully. My initial thinking is that the P fork will be shorter than the Bajaj one, but I haven't measured. We know a bajaj one will go into a VBB with some work from that Scoot! article.

The scoot article was about swapping it into a Rally 200, which uses the same fork as Sprint, from which the modern Bajaj is derived. I did the swap in my 75 and it was a piece of cake. Much different animal than a VBB...

A P fork should fit as far as the bearings go, but whether or not you'll be able to bolt on the headset is another issue. You could always just use the P headset. Having ridden both though, I prefer the Bajaj. Discs are nice but dive sucks.

I'm currently working on a custom leading link fork for my 77 that uses Bajaj components, which will incorporate a disc. I'm going to try to make it backwards compatible with the stock Bajaj front end (while keeping the anti dive geometry,) but it will be tricky...

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1975 Rally 200
1977 Rally 200
1979 P200E
1989 Suzuki GS500e

I've casually looked and measured, and it looks like there just isn't enough room for a Vespa/stella disc.

But what about a Lambretta disc? They've got the disc /in/ the hub.

Just thinking out loud here. Any ideas?

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The "X" stands for ex-Chetak owner.

I cant remember where...but someone once reccomeneded that I swap out the fork to get it done..

	matty_x wrote:
	I've casually looked and measured, and it looks like there just isn't enough room for a Vespa/stella disc. But what about a Lambretta disc? They've got the disc /in/ the hub. Just thinking out loud here. Any ideas?

If you mean the old lambretta discs, those aren't hydraulic, which is really the main point of the conversion. The stock drum used is really quite good. I'll take a good drum over a crappy disc any day.

If you mean the aftermarket ones, they use the same disc as the vespa kits, 200mm diameter.

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1975 Rally 200
1977 Rally 200
1979 P200E
1989 Suzuki GS500e

I'll be the first to say I don't know anything about Lambrokens except that everyone I know who owns one works on it more than they ride it.

I just recall seeing that the front brake had a disc inside the hub. I presumed that it was hydraulic. Guess not.

But, yeah, I'd prefer to have a drum over a disc if the disc is not hydraulic.

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The "X" stands for ex-Chetak owner.

	Nikolas wrote:
	I'm currently working on a custom leading link fork for my 77 that uses Bajaj components, which will incorporate a disc. I'm going to try to make it backwards compatible with the stock Bajaj front end (while keeping the anti dive geometry,) but it will be tricky...

I'm giving this a bump because I dropped off the Chetak at Motorsport Scooters yesterday for its 3000 mile service and ran into Nikolas. Its looking like he has succeeded in doing what he said in the above quote. It sounds like he's at the marketing stage and curious to guage how much interest there is out there. Perhaps he'll chime in soon with a few more details.

hey i'd be interested in better stopping ability but with no dive. i couldn't shell out cash for it right now but down the road for sho

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Lift the head light assly.

the mysterious PWR/NORM buttons...

	xcruckx wrote:
	Lift the head light assly.

Ha! Bullet number 8 on page 16 of the Chetak Service Notes. This has been uttered in our household on more than a few occasions lately. We've also found new uses for the adverb.

yeah i haven't been able to work it into an everyday conversation yet, but that was once true for swack (SWeet As f*CK) and now that is a common occurrence in my vocabulary.

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Lift the head light assly.

the mysterious PWR/NORM buttons...

Well, I'm not sure if I've succeeded or not. I've got a working computer model. Some of the clearances are very very tight. I'm ready to do a foam core mockup, but our laser cutter at school broke so I'm going to have to do it the old fashioned way. And school keeps getting in the way of my engineering! busy busy!

It should be less than the Grimeca kit for P-series. It depends on the components picked for the final version, and how fancy I get for the disc mounting, which is why I'd like some input.

I know my overall concept will work, its just a matter of finding a commercially available caliper that will work with it. I may just have to make my own. Right now I'm using a modified Chinese caliper off a new 'Lambretta.'

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1975 Rally 200
1977 Rally 200
1979 P200E
1989 Suzuki GS500e

Alright, I got the foam mockup done, and it seems to agree with my computer model. I'm going to do a few revisions, do some FEA, and then make a more accurate acrylic model. After that the real thing... I'm not sure how well this caliper is suited to a commercial application though.

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1975 Rally 200
1977 Rally 200
1979 P200E
1989 Suzuki GS500e

Just an update. I found a commercially available caliper that should work perfect. It's not cheap though, and will require some revision of my design. I'll still aiming at the Grimeca P-series kit as far as cost and quality goes though. I also just picked up a P200, so I may also develop a kit for that. Only one part would be different and that would make price go down and availability go up.

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1975 Rally 200
1977 Rally 200
1979 P200E
1989 Suzuki GS500e

@Nikolas: Did anything ever come of this?