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TangoSR
My other ride has balls!
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Joined: 10 Jan 2007
Posts: 335
Location: Essex
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| Posted: Sat Jan 20, 2007 10:12 pm Post subject: APRILIA SR BACK WHEEL DISC CONVERSION |
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I haven't done this modification myself yet...but I know it can be done.
I asked Rich off Italjetdragster.com about it, as he was selling his SR172 and I noticed he had converted the SR Back Drum Brake to a Disc Brake.
So here's a rough guide on what you would need to do.....as written by Rich 
Really easy hour job if you take your time.... You need a rear wheel, disc and caliper, hose and master cylinder off a runner.....Firstly just make sure you have the 2 lugs on the back casing to mount the caliper on... (all SR's I've seen do)
1. Scoot on centre stand, remove pipe and back wheel.
2. Remove brake shoes and springs and grind off flush the post that the shoes pivot on, also remove brake actuator arm, which just slides out.
3. The lugs have holes in them already but need drilling out and making a few mil bigger to accept the 2 caliper mounting bolts, do this now.
4. Fit runner hub, just like your old SR wheel with it's central nut
5. slide on caliper and bolt it up
6. Fit runner wheel with the 5 bolts
7. Run the hose to the bars (ya can cheat by taping the hose to the cable and pulling it thru, but it can get caught then it's bodywork off)
8. Off with the old brake lever and on with the new runner master cylinder and lever, you'll obviously have removed the handlebar cover..
9. Bleed it all up
10. Re-fit the handlebar cover, it's tight, but does juuust fit.
Job done, back brake as keen as a big brother applicant  |
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domino_7
My Lips are sealed
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Joined: 12 Feb 2007
Posts: 3
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| Posted: Tue Feb 20, 2007 9:14 pm Post subject: |
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Wot gilera runner are these bits from? 50 or 125? 2stroke or 4stroke? cheers |
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TangoSR
My other ride has balls!
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Joined: 10 Jan 2007
Posts: 335
Location: Essex
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| Posted: Tue Feb 20, 2007 11:49 pm Post subject: |
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 hello to you too 
Erm I should think it is off a Gilera 125 2 stroke as the casings are almost the same |
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BUXYBOI
I might be slow...But im ahead of you!
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Joined: 28 Feb 2007
Posts: 56
Location: LEEDS RIDES:YAMAHA SLIDER 50 & 172
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| Posted: Wed Feb 28, 2007 1:54 pm Post subject: |
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i always thought you needed a gilera runner hub? |
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TangoSR
My other ride has balls!
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Joined: 10 Jan 2007
Posts: 335
Location: Essex
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| Posted: Wed Feb 28, 2007 1:57 pm Post subject: |
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LOL it says fit gilera hub in step 4 Bux  |
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BUXYBOI
I might be slow...But im ahead of you!
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Joined: 28 Feb 2007
Posts: 56
Location: LEEDS RIDES:YAMAHA SLIDER 50 & 172
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| Posted: Wed Feb 28, 2007 2:00 pm Post subject: |
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oh im sorry i was looking in the bit where he said what you needed for the conversion, feeling quite noobish today  |
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domino_7
My Lips are sealed
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Joined: 12 Feb 2007
Posts: 3
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| Posted: Wed Feb 28, 2007 5:59 pm Post subject: |
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i jus brought a gilera runner ex125 hub and wheel off of ebay, the hub fits perfect and ill let u know wen i recieve da wheel. but so far its all gd. |
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TangoSR
My other ride has balls!
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Joined: 10 Jan 2007
Posts: 335
Location: Essex
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| Posted: Thu Mar 01, 2007 12:25 am Post subject: |
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 Yeah let us know how you get on...maybe take some photos of what your doing..as in a step by step guide? It would be a great help to anyone that wants to convert the back to disc and greatly appreciated |
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Rich
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Joined: 17 Mar 2007
Posts: 33
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| Posted: Sat Mar 17, 2007 1:34 pm Post subject: |
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Ahoy! .. Yeah I did rush the guide a little, but it is nice and easy with not much to catch you out.. There is a video under the stunting section on drag.com of dario (waynder) fitting the rear disc to his sr, but it's speeded up and doesn't really show you any detail.. But it's an easy job and transforms the rear brake. You really need it especially if your gonna be doing stuntwork. .. Yeah, all the bits you need you will find on 2t runner/dragsters 125 or 180's ..Beware tho, drag calipers are crap ajp items..Always go for a nice runner grimeca caliper. |
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Rich
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Joined: 17 Mar 2007
Posts: 33
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| Posted: Sun Mar 25, 2007 1:54 pm Post subject: |
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I'm breaking a runner 180 at the mo .. So I'm going to sell the parts to do a rear disc conversion on e-bay shortly if anyone fancies doing it to their SR125. |
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TangoSR
My other ride has balls!
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Joined: 10 Jan 2007
Posts: 335
Location: Essex
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| Posted: Thu Apr 26, 2007 11:55 am Post subject: |
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Thought I'd nick the piccy from Rich's ebay listing as to what parts you will need...so here it is 
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tomo9992
I might be slow...But im ahead of you!
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Joined: 28 Oct 2007
Posts: 75
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| Posted: Fri Jul 18, 2008 6:51 pm Post subject: |
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giving this agon now so fingers crossed lol |
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BUXYBOI
I might be slow...But im ahead of you!
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Joined: 28 Feb 2007
Posts: 56
Location: LEEDS RIDES:YAMAHA SLIDER 50 & 172
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| Posted: Sat Aug 09, 2008 4:52 pm Post subject: |
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tomo9992
I might be slow...But im ahead of you!
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Joined: 28 Oct 2007
Posts: 75
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| Posted: Thu Aug 14, 2008 8:12 pm Post subject: |
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it does mention in step 3 that you need to drill the holes a few mill bigger for the bolts lol |
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