Caliper Bolts.

suzi_bandit · Traffic Copper Joined: 21 Jul 2005 Karma :

Changed the front brake pads earlier and noticed that the bolts holding the calipers to the forks (2 bolts per caliper) all look like they've been, well, sort of stretched.
I can clearly see that they narrow near the centre.
I imagine that they've been over tightened in the past. Are they weak now and should I replace them? Or am I worrying about nothing?
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I want a big boys bike, preferably a Speed Triple. To date I have ?7:42p stashed away to put towards one. Need to get it in the bank & earning interest asap.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Not sure on your bike. Some bikes are fitted with single use stretch bolts to hold the calipers on.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

suzi_bandit · Traffic Copper Joined: 21 Jul 2005 Karma :

There's a 7 stamped on the end of them, any idea what that relates to?

Sorry to ask silly questions. I just didn't expect to see stretched bolts.
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I want a big boys bike, preferably a Speed Triple. To date I have ?7:42p stashed away to put towards one. Need to get it in the bank & earning interest asap.

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

What bike is it.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Surprised it has visably stretched (would have expected it to trash the thread in the alloy caliper before that point).

Not sure what the 7 refers to.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

If your not sure if they are ok change them,realy how much would
it cost for pease of mind. Wink

suzi_bandit · Traffic Copper Joined: 21 Jul 2005 Karma :

suzi_bandit · Traffic Copper Joined: 21 Jul 2005 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

If they really have stretched visably then I would agree that you should replace them.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Bezzer · World Chat Champion Joined: 14 Apr 2005 Karma :

Yep replace ASAP, cleaned up a neighbours B6 calipers a few weeks ago and one of the bolts just snapped as we were tightening it up and that was with a torque wrench nowhere near the actual torque. The others were waisted so all 4 were changed. The "7" refers to the tensile strength of the bolt material and is the lower end of the high tensile scale, but it is the correct one.
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Bezzer · World Chat Champion Joined: 14 Apr 2005 Karma :

https://www.hudsonfasteners.com/fast_guide/fg_grade_markings.htm

Halfway down the righthand side Thumbs Up

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I used to be indecisive but now I'm not quite so sure.

suzi_bandit · Traffic Copper Joined: 21 Jul 2005 Karma :

Thank you both very much.
I thought it didn't seem quite right for the bolts to be like this.
I'll get replacements asap.
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I want a big boys bike, preferably a Speed Triple. To date I have ?7:42p stashed away to put towards one. Need to get it in the bank & earning interest asap.

Ichy · World Chat Champion Joined: 15 Jul 2005 Karma :

Baloo · Two Stroke Sniffer Joined: 05 Jun 2005 Karma :

Suzuki bolts are made of a cheese / chocolate combination and should be changed for real ones.

I have changed the caliper bolts on my gixxer k4 for standard Honda 03 'blade ones. They may also work on your bike.

In 18 months the bolts on my bike have alll reacted badly to this UK weather we enjoy and I have replace them with titanium where possible or proper ones. Nothing bling mind you Laughing

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