Need to buy Bilstein Bumpstops but which ones

orlando · Post by **orlando** » Tue May 06, 2014 10:01 am

Hi guys,

I need to replace the bump stops in my 1985 M635CSI as they are cooked. My shock absorbers are Bilstein and I had a look today and the rear ones have the numbers 5210725W00. I have searched for this number and also googled it and find nothing.

Could you please help me to identify the shock absorbers? Are the bump stops standard? or are they shock dependant?

There is a post: An appeal for OEM Bilstein information where it appears that Brucey had cracked the code of the Bilstein part numbers, maybe you can help me.

Thank you.

m6dave · Post by **m6dave** » Tue May 06, 2014 10:22 am

Hi Orlando
The listed part number om realoem for an M635 rear bumpstop is 33522225023.
Pelican parts have this available for just under $20 each.
Cheers
Dave

orlando · Post by **orlando** » Tue May 06, 2014 11:58 am

Hi Dave,

Thank you for the reply. That is assuming that I have the original shock absorber and I don't know if I do. The part number in RealOEM for the absorber doesn't correspond to the numbers printed on the absorber itself.

Regards, Orlando.

GripGreg · Post by **GripGreg** » Tue May 06, 2014 4:53 pm

Orlando
What I've done to save some info, is to write some things down since I'm not able to save in a folder.
Bilstein's # is 858)386-5900. In San Diego, Cal. Actually, I think Poway, Cal.
Outside of San Diego?
Good luck,,,,Greg

Chris Wright · Post by **Chris Wright** » Tue May 06, 2014 5:11 pm

orlando wrote:Hi Dave,

Thank you for the reply. That is assuming that I have the original shock absorber and I don't know if I do. The part number in RealOEM for the absorber doesn't correspond to the numbers printed on the absorber itself.

Regards, Orlando.

Bilstein doesn't make bump stops for it's rear shocks, You just use the stock, external BMW bump stop and dust cover.

Now, the front Bilstein inserts don't use external bump stops as Bilstein includes the bump stops inside the inserts, at the bottom of the insert. Brucey has a post on the different Bilstein internal bump stops for the inserts if you do a search.

The BMW part numbers and the numbers on the parts themselves often don't match. The numbers on the part may be the manufactures/suppliers number.

Brucey · Post by **Brucey** » Wed May 07, 2014 8:22 pm

as others have pointed out the correct bumpstop at the rear is the BMW stock part. You might want to shorten it slightly if you go nuts with lowering but then keeping the bumpstop and shroud kept in the right place gets tricky.

At the front there are at least three choices of bumpstop, all bilstein part numbers (BMW will sell you the complete insert, but not just the bumpstop inside it).

Front part numbers and piccies here;

viewtopic.php?t=3039&highlight=bumpstops

These can also be cut down and in a way, it is an easier job because they don't locate a shroud or anything. You do have to dismantle the entire front strut which is a PITA though.

cheers

orlando · Post by **orlando** » Wed May 07, 2014 9:12 pm

Thank you so much to Dave, Chris and Brucey for your replies, it helps a lot. On my way to order the bumpstops.

Brucey, I still would like to identify the shock absorbers I have at the back, they have the numbers 5210725W00 in case I need to replace them too.

Thanks again an best regards, Orlando

GripGreg · Post by **GripGreg** » Wed May 07, 2014 9:39 pm

I did give you the number to Bilstein, right?
I just went to 'Bilstein.com' & even found a distributor in N.S.W.!

Brucey · Post by **Brucey** » Wed May 07, 2014 9:40 pm

they are the stock M635/M6 bilsteins

Old PN; B46-0725

New part number; 24-007252

The valving and the stroke are different from the bilstein sport shock, and of course the spring diameter is larger than that found on the other E24/2 (E28 chassis) shocks. You can use one of the other fitments provided you swap the spring perches over.

cheers

orlando · Post by **orlando** » Wed May 07, 2014 10:04 pm

GripGreg wrote:I did give you the number to Bilstein, right?
I just went to 'Bilstein.com' & even found a distributor in N.S.W.!

You did indeed Greg, Thank you so much. A bit tricky with the time difference between USA and Australia and work commitments but Saturday mornings are good for calling USA suppliers. Again Greg thank you.

Regards, Orlando.

orlando · Post by **orlando** » Wed May 07, 2014 10:25 pm

Brucey wrote:they are the stock M635/M6 bilsteins

Old PN; B46-0725

New part number; 24-007252

The valving and the stroke are different from the bilstein sport shock, and of course the spring diameter is larger than that found on the other E24/2 (E28 chassis) shocks. You can use one of the other fitments provided you swap the spring perches over.

cheers

Thank you very much Brucey. I don't intend to lower the car, just keep it as it is. You have come up with the goods again!!!
Regards, Orlando.

Chris Wright · Post by **Chris Wright** » Wed May 07, 2014 10:51 pm

You can go to the Bilstein website also, much of this info is on there.

GripGreg · Post by **GripGreg** » Wed May 07, 2014 10:53 pm

Orlando, re-read my edited version!

jps635 · Post by **jps635** » Tue Jun 10, 2014 9:38 am

For those running H&R springs with bilstein sports are you trimming the rear bump stops and if so, by how much? I realise this is somewhat dependent on where the rear spring perches are sitting, but assuming is in keeping with front height.

Thanks Chris

AusE24 · Post by **AusE24** » Thu Jun 12, 2014 11:30 am

orlando wrote:
GripGreg wrote:I did give you the number to Bilstein, right?
I just went to 'Bilstein.com' & even found a distributor in N.S.W.!
You did indeed Greg, Thank you so much. A bit tricky with the time difference between USA and Australia and work commitments but Saturday mornings are good for calling USA suppliers. Again Greg thank you.

Regards, Orlando.

Hello Orlando,

How are you going, Hope all is well.

If you are buying Bilsteins from the USA, Look up E-Shocks. They are Bilstein agents and the prices are great. I bought 4 Bilsteins for my Navara and they cost me $450 the set incl Freight and arrived in 4 days!! Top service.

Regards

Greg

Brucey · Post by **Brucey** » Thu Jun 12, 2014 6:46 pm

jps635 wrote:For those running H&R springs with bilstein sports are you trimming the rear bump stops and if so, by how much? I realise this is somewhat dependent on where the rear spring perches are sitting, but assuming is in keeping with front height.

Thanks Chris

I'd suggest that you tune this by trial and error.

Be careful though; if you trim one end much, the shroud falls off the bump stop, and if you trim the other end much the bump stop slides down the shaft.

cheers

orlando · Post by **orlando** » Fri Jun 13, 2014 1:41 am

Hi Greg,

Things are going really well. Thank you so much for the lead up. Good to know the supplier.

The shocks were good after having them checked. I ended up installing new mounts, new bump stops where applicable, new dust boots and new hardware (bolts, nuts etc).

I took the opportunity to also treat the rust in the struts and painted them and the spring coils with Por-15.

They look great and the ride is lovely. I have only done the back ones as I am waiting for some parts for the front.

slofut · Post by **slofut** » Wed Jul 23, 2014 12:03 pm

AusE24 wrote:
orlando wrote:
GripGreg wrote:I did give you the number to Bilstein, right?
I just went to 'Bilstein.com' & even found a distributor in N.S.W.!
You did indeed Greg, Thank you so much. A bit tricky with the time difference between USA and Australia and work commitments but Saturday mornings are good for calling USA suppliers. Again Greg thank you.

Regards, Orlando.
Hello Orlando,

How are you going, Hope all is well.

If you are buying Bilsteins from the USA, Look up E-Shocks. They are Bilstein agents and the prices are great. I bought 4 Bilsteins for my Navara and they cost me $450 the set incl Freight and arrived in 4 days!! Top service.

Regards

Greg

Great link Greg, thanks much!
Bill