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james.houpt
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VBMWMO #7983
Joined: 04/17/2011
Posts: 13

I have a R75/5 and I would like to ask others their opinions on fork springs and weight of oil. I weigh around 195 pounds and do mostly solo riding. Should I replace the springs with stock or switch to progressive springs? What type and weight of oil should I use?
I would like to hear what works well for others.
Thanks,
Jim from Pasadena

anderson7585
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VBMWMO #7585
Houston, Texas
Joined: 07/24/2009
Posts: 334
I am making these decisions

I am making these decisions right now for my 1973 R75/5 and I (think) I have decided on:
Progressive Suspension Fork Spring # 11-1101 and BMW 7.5 wt fork oil.

I'm about 230 pounds and ride solo almost all the time with no luggage.

Vince

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1973 BMW R75/5 (LWB) "Griselda" (stock looking but with logical/practical improvements), 1971 Norton Commando "Commando Bizarro" (a truly strange custom project), 1952 Triumph TRW "Pokey" (being dressed as an RAF Dispatch bike), 1936 BMW R2 "Ediltrudis" (stock, currently out getting a pro restoration). www.vinceandersononline.com

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 4679
I'm still running stock

I'm still running stock standard springs in my /7. I'm also less than 200 lbs, ride solo, and have a Luftmesiter fairing on the front. 7.5 wt BMW fork oil.

I saved something from Tom Cutter, Airhead independent mechanic in eastern PA. He said that people in this weight range are best served by the OEM standard spring with 3/4" PVC spacers to help with the preload. He also said that YSS and Wilbers offer a better choice than Progressive for front springs. Note that BMW also offers a heavy duty spring. Info on the OEM springs are:

Description Part number Length Wire Diameter
Standard 31 42 1 231 358 567 mm 4.00 mm
Heavy Duty 31 42 1 232 017 543 mm 4.25 mm

The heavy duty spring is better for bikes with heavy fairings, like the the RT or RS fairing. But I've been fine with my set up...I don't consider the Lufty heavy.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

anderson7585
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VBMWMO #7585
Houston, Texas
Joined: 07/24/2009
Posts: 334
I did some checking

I did some checking and:
Progressive springs are about $60.00.
YSS springs are $128.00.
Wilbers will not tell me how much they are, in my experience that means I can not afford them (I will assume them to be 18 Bazillionty dollars).
BMW springs are about $80.00.

I think I'll go with Progressive or BMW.

Vince

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1973 BMW R75/5 (LWB) "Griselda" (stock looking but with logical/practical improvements), 1971 Norton Commando "Commando Bizarro" (a truly strange custom project), 1952 Triumph TRW "Pokey" (being dressed as an RAF Dispatch bike), 1936 BMW R2 "Ediltrudis" (stock, currently out getting a pro restoration). www.vinceandersononline.com

olderbeemer
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Joined: 02/09/2011
Posts: 5
Progressive Springs

Hi Vince
FYI..........Those are Progressive springs in it now.
Roger

anderson7585
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VBMWMO #7585
Houston, Texas
Joined: 07/24/2009
Posts: 334
Roger, Thanks, I'm not having

Roger,
Thanks, I'm not having any "fork issues" I just did not know if they had been looked at.
I have installed Avon Roadrider tires, LED "dancing" brakelight, the rear rack (saddlebags have been sold), R90S handlebars, Albert mirrors and a headlight crashguard (check out my gallery).

At home I have Hagon shocks a new turn signal relay and LED turn signal bulbs waiting to be installed and I have found a widened centerstand for it (it's being repainted right now).

She (Griselda) is a real head-turner, I draw a crowd everywhere I go!, all the minor "issues" that we talked about went away when I started riding her regularly (she just needed to GO!).

Vince

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1973 BMW R75/5 (LWB) "Griselda" (stock looking but with logical/practical improvements), 1971 Norton Commando "Commando Bizarro" (a truly strange custom project), 1952 Triumph TRW "Pokey" (being dressed as an RAF Dispatch bike), 1936 BMW R2 "Ediltrudis" (stock, currently out getting a pro restoration). www.vinceandersononline.com

olderbeemer
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Joined: 02/09/2011
Posts: 5
Hey Vince Glad to hear you

Hey Vince
Glad to hear you are having fun with her! I just didn't want you to spend money on a set of Progressive springs when those had already been replaced........and you are right, she just needed to be ridden!
Take care,
Roger

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