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BR-5800 rear caliper fastening bolt is too long

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BR-5800 rear caliper fastening bolt is too long

Old 04-11-17, 06:39 PM
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peugeot mongrel
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BR-5800 rear caliper fastening bolt is too long

I'm putting a pair of BR-5800 calipers on a 85 Pinarello that has a bridge for a recessed nut. Both front and rear calipers have the same fastening bolt which is too long for the rear with a recessed nut. I thought Chain Reaction sent me 2 fronts but when I look on the 5800 parts list it shows only one length mounting bolt with several pivot nuts from 10.5 to 32mm in length. The 10.5 listed for the rear.

BR-5700 has a long & short pivot bolt for front & rear.

Has anyone else run into this problem with BR-5800 or am I missing something?
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Old 04-11-17, 06:43 PM
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Apparently Shimano simplified their parts list by making the BR-5800 mounting bolts the same front and rear and, yes, it's new to me too. All of my brake calipers have different bolt length for the front and rear but they are all older models.

As noted, the cure is to get a suitably short nut or shorten one of then ones you have.
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Old 04-11-17, 06:49 PM
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Sometimes shortening the nut isn't an option because the bile may extend too far. Namely to the hex key end of weven the shortest nut.

The fix is to use a serrated washer between the brake and frame. That pushes the brake away solving the problem, plus helps keep the brake from moving. If you need more, add another washer, but I can't imagine a situation where you'd need more than 3-4mm.
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Old 04-11-17, 06:55 PM
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Originally Posted by HillRider View Post
Apparently Shimano simplified their parts list by making the BR-5800 mounting bolts the same front and rear and, yes, it's new to me too. All of my brake calipers have different bolt length for the front and rear but they are all older models.

As noted, the cure is to get a suitably short nut or shorten one of then ones you have.
The bolt is too long by a lot and smaller in diameter with no threads next to the caliper. I've got the shorter nut but I'm not really liking the solution of cutting the bolt off. I'm just wonder what others have done? Using a nut and filling the recess seems like a bit of a shame for looks.

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Old 04-11-17, 07:08 PM
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Originally Posted by FBinNY View Post
Sometimes shortening the nut isn't an option because the bile may extend too far. Namely to the hex key end of weven the shortest nut.

The fix is to use a serrated washer between the brake and frame. That pushes the brake away solving the problem, plus helps keep the brake from moving. If you need more, add another washer, but I can't imagine a situation where you'd need more than 3-4mm.
The bolt is 27mm - same as the front on my 6500s. The bridge is 15mm so even a couple of spacers is not enough. I thought they just sent me 2 fronts until I looked at the parts list. I am sort of hoping I am wrong and I can get a 5800 caliper with a short bolt. I can't check with a supplier right now but others that have 5800 should know.
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Old 04-11-17, 07:52 PM
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Originally Posted by peugeot mongrel View Post
The bolt is 27mm - same as the front on my 6500s. The bridge is 15mm so even a couple of spacers is not enough. I thought they just sent me 2 fronts until I looked at the parts list. I am sort of hoping I am wrong and I can get a 5800 caliper with a short bolt. I can't check with a supplier right now but others that have 5800 should know.
Shimano aren't idiots. They KNOW that a modern rear brake bolt must be shorter than the thickness of stay bridges, ie. about 10mm or so.

So, I'll give Shimano the credit they're due (regardless of the possible parts list error) and say the seller sold you two fronts, or some similar error.
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Old 04-11-17, 08:01 PM
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Originally Posted by peugeot mongrel View Post
I'm putting a pair of BR-5800 calipers on a 85 Pinarello that has a bridge for a recessed nut. Both front and rear calipers have the same fastening bolt which is too long for the rear with a recessed nut. I thought Chain Reaction sent me 2 fronts but when I look on the 5800 parts list it shows only one length mounting bolt with several pivot nuts from 10.5 to 32mm in length. The 10.5 listed for the rear.

BR-5700 has a long & short pivot bolt for front & rear.

Has anyone else run into this problem with BR-5800 or am I missing something?
My 5800 calipers came new in the box with an assortment of recessed nuts in several lengths, and the rear most definitely has a shorter mounting bolt. So it really sounds as if you received two front brakes. Were they in the blue Shimano box, and was the box un-opened?
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Old 04-11-17, 08:17 PM
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They list 2 different part numbers for front and rear. IBR5800AR82S for rear and IBR5800AF82S for the front
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Old 04-11-17, 08:19 PM
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Originally Posted by rowebr View Post
My 5800 calipers came new in the box with an assortment of recessed nuts in several lengths, and the rear most definitely has a shorter mounting bolt. So it really sounds as if you received two front brakes. Were they in the blue Shimano box, and was the box un-opened?
Good to know, I couldn't believe it when the parts list only showed the nuts as a difference. Real pain they sent me the wrong one but they'll fix it since the short bolt caliper exists.

They were from Chain Reaction and not in Shimano boxes. They were wrapped in plastic bags with stickers. They already sent me black STIs marked silver and took about 3 weeks to swap. I should have checked the calipers more closely then. They are really fast shipping out. Not so fast on swaps. Bummer one caliper doesn't ship free. Maybe I'll order the pair for the free shipping & return both for the refund.
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Old 04-11-17, 08:38 PM
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Originally Posted by dedhed View Post
They list 2 different part numbers for front and rear. IBR5800AR82S for rear and IBR5800AF82S for the front
thanks
that will help me get the right one.
I was looking at EV-BR-5800-3716.pdf from Shimano's site which is no doubt consumer info. Where do you get that parts list?
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Old 04-11-17, 09:56 PM
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Old 04-12-17, 06:30 AM
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Originally Posted by peugeot mongrel View Post
They were from Chain Reaction and not in Shimano boxes. They were wrapped in plastic bags with stickers.
What you got were parts intended for OEM installation, not retail sale so the mis-match was done by Chain Reaction.

Years ago there were a lot of "gray market" parts sold by big retailers like Nashbar, Performance, etc. They were left-over parts that the big bike manufacturer's such as Trek had in excess and were sold to these retailers at very attractive costs and then sold to consumers at good prices too. They came in the OEM style bubble wrap packaging, not retail boxes, and that's how you knew.

I guess it's still being done. About a year ago I bought two NOS Shimano FC-5703 triple 105 cranks since they are the last road triples with a separate bolt circle for the granny chainring. I purchased them from two different UK retailers and one came in a neatly compartmented Shimano retail box intended for LBS sale and the other came in a crude cardboard box with the components wrapped in bubbler wrap and it was obviously not intended to be sold over the counter in a bike shop.

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Old 04-12-17, 07:40 AM
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Originally Posted by HillRider View Post
What you got were parts intended for OEM installation, not retail sale so the mis-match was done by Chain Reaction.

Years ago there were a lot of "gray market" parts sold by big retailers like Nashbar, Performance, etc. They were left-over parts that the big bike manufacturer's such as Trek had in excess and were sold to these retailers at very attractive costs and then sold to consumers at good prices too. They came in the OEM style bubble wrap packaging, not retail boxes, and that's how you knew.

I guess it's still being done. About a year ago I bought two NOS Shimano FC-5703 triple 105 cranks since they are the last road triples with a separate bolt circle for the granny chainring. I purchased them from two different UK retailers and one came in a neatly compartmented Shimano retail box intended for LBS sale and the other came in a crude cardboard box with the components wrapped in bubbler wrap and it was obviously not intended to be sold over the counter in a bike shop.
Yes they still do that.
With this order with 2 items in a group had the label on the bubble wrap correct but the product inside not. Some of the parts came in Shimano boxes.

They are no quibble about making it right and offer a $1.99 return shipping but very slow.

My true concern this time was to make sure if I return for the right one that what I want exists so I don't just get the same thing back. I still haven't been able to find a spec on the IBR5800AR82S - rear. I am waiting for a reply on that specific question from Chain Reaction.

In all fairness I bought a silver 5800 group as individual pieces. They said out of stock as a total group with my config in silver. All of the other UK suppliers are $50-$70 more for silver so that overstock is drying up.
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Old 04-12-17, 09:41 AM
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As a follow up Chain Reaction just responded with an apolligy and has already dispatched the correct caliper with the note - no need to return the incorrect one.
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