Honda CB125T - Spoked front disc

[mattress_man]

Hey guys

I'm upgrading my '81 CB125T Cafe Racer project from a 'it looks cool but doesn't work' drum brake to a slightly more efficient disc brake.

I've picked up a calliper and master cylinder from a modern CBR125 and I'm now looking for options for a spoked wheel.

So far I've found the CB125RS seems to fit the bill but that's only from looking at photos. The 125T had spokes and a disc at some point in history but I'm hoping for a more modern option so I can get something that I don't have to restore.

I assume there are lots of 18" spoked front wheels out there, just could do with a bit of guidance. Cheers!
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1981 Honda CB125T - Cafe racer project.

https://www.bikechatforums.com/viewtopic.php?t=246188

[RyanTZR125]

I've just been reading back through your old project thread today, how is that going, did you get the brake side rearsets done? Purely for self interest as I'm doing my h100 into a cafe racer and would love some updates

Sorry slightly off topic
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1980 Honda H100A, Cafe racer. (SOLD)
1998 Yamaha TZR 125 4HX.
1999 Yamaha R6 YZF

[tomh]

Disc brake CG's (2004 onwards) has a 2.75 18" wheel. How are you planning to mount the caliper?

[mattress_man]

Hey

yeah its been a while since my last update, project is going well but have have moved from Cardiff to Brighton so that has set things back. Luckily my new neighbour restores Lambrettas and is gonna sort me out with some garage space. It'll be like mods and rockers all over again

I have two options with the rear brake, one is to complete plan A which is a home made linkage and the other is to buy some univerals and start again.

Although having explored hydraulic discs it is tempting to consider a rear conversion too. At least then you would have a flexible line going to the rear axle rather than having to sort out the challenge of getting the brake rod attached to the rearset.... which I assume is your main problem!?

My priority is the front brake for now hence the request for a spoked disc.
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1981 Honda CB125T - Cafe racer project.

https://www.bikechatforums.com/viewtopic.php?t=246188

[DMCpro]

[mattress_man]

Cheers Tom

I have the original 125T forks which have caliper mounting points. They will do for a mock up at least. They are a bit tired though so sourcing some CBR forks to match the caliper would be good.

I'm going for spokes just for the look although it does get expensive if I've got to re-lace them and chrome them etc.

I've been trying and failing to sell a job lot of parts including the comstar wheels. failed again last night so I've still got them. Sooo ultimate quick and easy option for MOT would be original forks and wheels upgraded to hydraulic disc.
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1981 Honda CB125T - Cafe racer project.

https://www.bikechatforums.com/viewtopic.php?t=246188

[kestrel]

Mixing and matching front end components can often turn out to be an expensive nightmare to get right.
You need to ensure that there is sufficient clearance between the spokes and the inside face of the disc to accept the caliper you plan to use. If there is insufficient clearance then you will either have to source a disc with a larger offset (and the correct bolt pattern), or machine a disc spacer. The amount that you can move the disc is small as you also have to ensure that there is adequate clearance between the disc and the fork leg.
Having sorted the caliper and disc clearances you then have to either fabricate or machine an adaptor plate to actually mount the caliper to the fork leg.
A much easier option would be a complete front end swap, ie forks, yokes, wheel, axle, disc and caliper. By doing it this way you know that everything fits. If you're lucky then you just might get away with changing the headstock bearings, worse scenario is that you'll have to swap the neck spindles over, neither of these options is rocket science.
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Isle of Man.........Road Racing Capital Of The World

[Teflon-Mike]

Simplest would be a Disc-Brake CG125 front end.
I believe that the fork stanchions are the same diameter as the earlier twin-shock twin, and I think that the yoke spacing and offset is even the same; so the CG forks ought to slide straight into the CB yokes, which would give the assurance that the wheel, disc fork slider & caliper all mount up and mount up securely, as they would on a CG and nothing gonna rattle shake or break when you brake.
CG's tyre sizing is even the same as the CB-Twin.
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'