I was about to place an order for a set of Performance Machine direct bolton 6 piston calipers for my 08 model Street Bob. Luckily, I've asked the quesiton whether their would fit without any modifications. Unfortunately - they will not! The caliper only fits 11 1/2" disc. Indeed, every model SB up to 2008 had the 11 1/2" disc.

However, in their "infinite wisdom" for 2008 HD had changed the disc diameter for 2008 model Street Bob and some other 08 model softails to 11.8".http://www.hdforums.com/micons/m15.gif Obviously, a larger disc diameter means better braking performance but once again the aftermarket accessories will no longer fit. This was also the case with risers being "built-in" to top tripple tree which prevents 08 model SB owners from utilising "pull back" handle bars similar to Burleigh.

Is anyone aware of any other slight modifications that factory has introduced on 2008 model Street Bob and that are not widely publicised?

Are there any other 6 piston calipers that will fit 08 Street Bob without modifications?

The obvious solution is to use PM 11.2" disc. However IMHO it would constitute a step back since PM discs are smaller in diameter and semi-floating. While HD discs are fully floating.

So any ideas guys/gals?

ta
Vlad

why dont u get a 07 front rotar???

Well, I could potentially get an 07 front rotor but it is smaller in diameter. The idea here is to improve braking by changing over to 6 piston calipers. It makes no sense to utilise larger calipers with smaller disc. The resultant braking performance might not improve.

11.5 and 11.8 is hardly a diffrence man the six piston over a 07 disk would produce better stopping over a 11.8 with a stock caliper

If you are really after vetter braking, go to the V-Rod twin...Unbelieveable difference.

i had no idea that the 15 thousanths of an inch difference was so large. if the pm 6 piston calipers don't fit i would be surprised.

tomato - love your v-rod setup! Would you care to provide a detail description of what is required to upgrade to v-rod setup.
I'd imagine that you need at least the following:

1. V-rod front forks
2. V-rod front discs
3. V-rod front calipers

What model V-rod did you use as a donor bike? What modifications do you need in order to fit the above? I would appreciate any detailed info?

Have you considered the Fat Bob twin setup?

First of all the internal valving is different on the V-Rod than your bike. The V-rod is also 2" shorter. Once you completely set up your bike you also need to buy a 2" (approximate) shock. I have all of the parts needed to do this job at HD. Will pick them up tomorrow & get to work. Once we figure it out, we will put one on Jay Risk's bike for testing. Might even do Mudd's bike also. Jay wants Brembo's. tomato, good job and rims looks nice. Always been a sucker for the red ones.

Ps the rotors are 300 millimeter = 11.811 023 622 inch or 0.15551" (Radis) (Around 5/32") larger than your stock rotors. I do not think it would work as I have a set of 6/differential PM's and they are very tight against the top of the 11.5" rotor. $499 X 2 = alot of investment to sell on e-Bay

FastHarley - Please keep us posted on your progress. Would love to know the exact details/problems of the conversion.
Have you considered the Fab Bob twin setup?

Monday update

Others have tried it and the only way that works is if you use new trees off of a FB. The calipers do not line up with the rotors, understandability. Do a search or "talk" with the member who posted photos on this forum. This approach is not the one I wanted to take.

My goal is to use your mid-glide (stock) trees, a 2X hub like the one found on your spoked wheel, add a 300 mm rotor and add caliper(s). Of course you need lowers w/2X caliper mounting points. When/if we come up with a viable solution, I shall post only after it has been extensively road tested for reliability and safety. This must be a cost effective modification only.

I do not own a 06 & above bike to personally test it on. I have tried to buy a complete 49mm front end to put on my 05 Dyna for testing only. The member here who had the complete front end has not contacted be back yet with repleted attempts on my side. I will pick up the brand new stuff from HD today or tomorrow. Our first step.

Jay Risk has been working with me and has professed to give a truthful and honest evaluation for you guys. He owns this type of bike.

Here is the deal. You can not mix and match the lowers on a Dyna unless you do the following:
If you buy fat bob lowers and use the mid-glide trees, it will require machining the calipers/lowers. Not a good option. You can not use a Dyna stanchion (fork) tube than use a V-Rod Flute (Seat Pipe, #46635-07) as it is shorter (see photo). You can not use a Dyna (stock) Flute (Seat Pipe, #46618-06) with a V-Rod lower as the V-Rod is 6 mm and the Dyna has a 12 mm socket bolt (#46614-06). This goes in the bottom of the V-Rod lower and connects to the Dyna (stock) Flute (Seat Pipe, #46618-06). Modifying the V-Rod lower is impractical and IMO unsafe as there is not enough material to modify it. Our solution is making the internal suspension and while we are at it, put in a form of emulator and change the spring rate to one that is comparable to the owners weight and riding style. We are in there so why not do the work to improve the ride. We will also design & make a complete cartridge system (X-Factor) for this conversion. I have done the research, made the drawings, and today I will build the prototype. Jay Risk and hopefully Mudd will install them on their bikes for testing & be good enough to give a truthful evaluation such as improved stopping distance and ride quality. That is up to them to post and take their time to do this and compose for your information. This cost me $108.00 to view this (+ screws + spring et al.) and have the flutes to shoot this photo. Special order only.


local://upfiles/29413/D3B70B5571E14F218D310EDC07A782AC.jpg

ORIGINAL: FastHarley

Here is the deal. You can not mix and match the lowers on a Dyna unless you do the following:
If you buy fat bob lowers and use the mid-glide trees, it will require machining the calipers/lowers. Not a good option.
You can not use a Dyna stanchion (fork) tube than use a V-Rod Flute (Seat Pipe, #46635-07) as it is shorter (see photo).
You can not use a Dyna (stock) Flute (Seat Pipe, #46618-06) with a V-Rod lower as the V-Rod is 6 mm and the Dyna has a 12 mm socket bolt (#46614-06). This goes in the bottom of the V-Rod lower and connects to the Dyna (stock) Flute (Seat Pipe, #46618-06). Modifying the V-Rod lower is impractical and IMO unsafe as there is not enough material to modify it.
Our solution is making the internal suspension and while we are at it, put in a form of emulator and change the spring rate to one that is comparable to the owners weight and riding style. We are in there so why not do the work to improve the ride. We will also design & make a complete cartridge system (X-Factor) for this conversion. I have done the research, made the drawings, and today I will build the prototype.
Jay Risk and hopefully Mudd will install them on their bikes for testing & be good enough to give a truthful evaluation such as improved stopping distance and ride quality. That is up to them to post and take their time to do this and compose for your information.
This cost me $108.00 to view this (+ screws + spring et al.) and have the flutes to shoot this photo. Special order only.
http://img503.imageshack.us/img503/6471/howardseatpipes500ei7.jpg





Sounds like you are getting it narrowed down Howard.

This should work into a really nice package.

mud

JUst got home and finished with all drawings. Now we make them. Jay Risk is takinng off his front end and shipping the whole thing down to me including wheel, axle et al. Leave just the neck. It looks do-able but just like the guy who leaped off the 100th story roof and the woman stuck her head out and asked "How Is It Going?....The leaper said, So Far - So Good!

Will keep all that is intrested informed.

Update. I have just came back from the shop and we are making the internals to make this work. Until I have an actual working system and on Jay Risks bike, it is only a theory. It should...repete should work. The only way to make this to work is by making the flutes, doing away with the oil lock system & replacing this system with an air spring system. If you do not, than when the forks bottom out the hydro-lock (oil lock) use to be, the system could crush if you hit a "square" enough bump. That is where the prevention comes in with an air spring.

If you were to use a complete V-Rod front end, they are about 2" shorter (I'm estimating/guessing) than the 32" Dyna front ends.

If you were to try to use a V-Rod lowers on the Dyna, they would be about 1 1/2" to 2" shorter at least. Look at the reference on the two Flutes by Mud.

You can not use the stock Dyna (big) flutes on a V-Rod lower.

Well, make the internals, put it together, buy Brembo calipers, buy one or two 300 rotors and we will than discover what adventures are left in store for us. Caliper/rotor alignment is very important.

Keep you informed if you are so inclined to read.............H

Update
Better news, the hubs are the same flange on both sides and I mounted up the rotor to both sides and they work fine.

local://upfiles/29413/2A4F1D2426C44D51B4C9AE8EFEBBE2C9.jpg

An update.

we have all of the internal parts made to put Jay Risks front end (06 Dyna Street Bob/Mid Glide) together but for one snag. I have only received the v-Rod Lower forks and 1 right hand Brembo caliper.

I do not know what is wrong with Harley but over 3 weeks and no parts? Who needs a bike with no availability of parts. In the 70's all Harley dealerships in the Miami area had parts in stock! They had counter persons (Parts Guys) who knew motorcycles. They knew what fit & knew how to modify the part to fit if it was unavailable.

So much for nostalgia! Everything went South once they put a stock ticker on the front page.

I am sure the duel disks will work on a stock 49mm mid-Glide using the stock 19" wire wheel. Pictures to come if Harley ever delivers my parts!

Howard,
Looking forward to seeing your photos when posted..
I know from conversations you havebeen working pretty hard.

Thanks for the update,
Woodreaux

Keep us updated FastHarley. Kudos to you for following this to the end.
Can't wait for the final solution.

Harley said I get all of my parts tomorrow!!!! This remains to be seen. Bastards! I hate the suits. 3 or more weeks, just for parts to rebuild a 49mm fork. I did buy brembos for the front, however. I will be ready to have them together in 45 min after leaving Harley (completed). I will put em' together dry, make all observations & final measurements as far as travel. I did make the internals to put the front axle exactly the same place as in relation to to top of the triple tree.

After final assembly (wet & checked), I will take it apart & assemble it on one of my show front display stands, trees & all, just like it would be on the motorcycle. I will mount the tire, rotors, calipers, fender, et al. This will check everything as on the bike. I will than get the SS braided brake lines & fitting as well as a 11/16" duel disk master cylinder in place of the single pot M/C.

For those into giving opinions to Jay Risk: Would God prefer 16" flying apes or low & lean drag bars on this street stalker?

ORIGINAL: FastHarley

Harley said I get all of my parts tomorrow!!!! This remains to be seen. Bastards! I hate the suits. 3 or more weeks, just for parts to rebuild a 49mm fork. I did buy brembos for the front, however. I will be ready to have them together in 45 min after leaving Harley (completed). I will put em' together dry, make all observations & final measurements as far as travel. I did make the internals to put the front axle exactly the same place as in relation to to top of the triple tree.

After final assembly (wet & checked), I will take it apart & assemble it on one of my show front display stands, trees & all, just like it would be on the motorcycle. I will mount the tire, rotors, calipers, fender, et al. This will check everything as on the bike. I will than get the SS braided brake lines & fitting as well as a 11/16" duel disk master cylinder in place of the single pot M/C.

For those into giving opinions to Jay Risk: Would God prefer 16" flying apes or low & lean drag bars on this street stalker?

Based on what you're doing (going for improved function over improved form), I'd say drag bars, no question! And mid controls rather than forward, for that matter! (even though you didn't ask)

Howard,
You've been patient waiting on the MOCO.
Looking forward to see the fitment.

Woodreaux

PU parts but Harley did not realize I needed all of my parts. They forgot the inner bushings, wait some more. I did dry assemble the forks with the old bushings and they are the same length as stock (measured them) and the innards will work as well as any gold emulator/custom sprung 49 mm fork. No change or surprises. This will ride exactly the same with 2 calipers/V-Rod lowers as the 49mm Race Tech done by us on a stock bike.........Wait some more.

Hi Guys,

I've got a 2008 wide glide and was inquiring about swapping the stock front caliper with a PM 6 piston part#0051-2915-CH Left-Side

I called PM twice and spoke to 2 different tech support guys (PM# in case anyone wants to call 800-479-4037) and they both confirmed in their catalog that this part will work on the 2008 models with the 300mm (11.8) rotor. This goes against what I have read in this blog - so now I am confused.

My next step - I currently have a PM 6 piston bolted onto my 2000 softail with a 11.5" rotor. I plan on unbolting it from the softail and placing on the 2008 dyna wide glide and checking for clearance and any rubbing of the rotor inside the caliper. If anyone has done this already and can save me work please reply back and let me know :)

Thanks,
Mark

Here's a good question: Did the Harley Davidson part number for dyna calipers change from 2007 to 2008? If it did, then I'd be skeptical of what the PM guys are telling you. If it didn't change that would seem to reinforce the possibility that the PM part would work too.

UPDATE:
http://www.harley-davidson.com/gma/gma_product.jsp?PRODUCT%3C%3Eprd_id=84552444210155 3&FOLDER%3C%3Efolder_id=2534374309149157&ASSORTMEN T%3C%3East_id=2534374309149157&bmUID=1210880537827 &bmLocale=en_US
This chrome caliper kit has a different part number for 08 than for 00-07. Your plan to try the caliper from the 2000 Softy seems sound; keep us posted.

still waiting for my bushings from HD

go here for post (http://www.hdforums.com/m_3449033/mpage_1/key_/tm.htm#3449040)