Weight of Shimano FC-5703 triple with bearings

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NetworkMan
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Weight of Shimano FC-5703 triple with bearings

Postby NetworkMan » 26 Aug 2019, 5:30pm

It looks as if the Shimano 105 FC-5703 is being sold off as it's probably now obsolete. If it offers a decent weight saving I might consider one but I just can't find a statement of the weight with the bearings. Oh, and yes, I know there are doubts about bearing life
I have a Spa TD2 which is probably about 750 gm with crankbolts and a BB at about 250 g so around 1 kg, the lot.
Anyone know what the 5703 is with bearings?

keyboardmonkey
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Re: Weight of Shimano FC-5703 triple with bearings

Postby keyboardmonkey » 26 Aug 2019, 8:53pm

Obsolete?!!? How very dare you?

My FC-5703 is still off the bike, so if no one gets back to you I’ll whip the pedals off my cranks and get the scales out.

The 5700 BB has been in situ for - I think - 3 or 4 years and is staying there until it fails, so I’ll not weigh that.

You might struggle to get a 5700 BB in any case; the replacement I have lined up is a 6800 model. I can weigh that and a 6700 I still have somewhere to give you an idea if that’s any good.

NetworkMan
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Location: South Devon

Re: Weight of Shimano FC-5703 triple with bearings

Postby NetworkMan » 26 Aug 2019, 9:18pm

That's very kind of you, and I should have said desirable but soon to be no longer on sale, not obsolete! Not to worry about the BB, I've seen figures of 90 gm. so that will do.

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cycleruk
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Re: Weight of Shimano FC-5703 triple with bearings

Postby cycleruk » 26 Aug 2019, 9:45pm

The 5703 is 10 speed and, as I'm sure you are aware, 105 has gone to 11 speed now. :(
So yes basically obsolete.
I have two 5703s but no idea how much they weigh as they are both on bikes. Sorry not going to take them off.
Certainly bearings don't last as the one on my winter bike is on it's 3rd set in about 13,000 miles but very easy to change as and when. They have been through a few very wet winters and any time the road is damp even in summer. My standard cartridge bearing would last a lot longer in the same circumstances.

Rosebike list 5703 as 850g but not stated with or without the BB.
i would presume without the BB.
https://www.rosebikes.co.uk/shimano-105 ... set-443978

Another site listed as 907g but again no statement as too with or without.
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NetworkMan
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Joined: 25 Aug 2014, 11:13am
Location: South Devon

Re: Weight of Shimano FC-5703 triple with bearings

Postby NetworkMan » 27 Aug 2019, 9:37am

cycleruk wrote:The 5703 is 10 speed and, as I'm sure you are aware, 105 has gone to 11 speed now. :(
So yes basically obsolete.
I have two 5703s but no idea how much they weigh as they are both on bikes. Sorry not going to take them off.
Certainly bearings don't last as the one on my winter bike is on it's 3rd set in about 13,000 miles but very easy to change as and when. They have been through a few very wet winters and any time the road is damp even in summer. My standard cartridge bearing would last a lot longer in the same circumstances.

Rosebike list 5703 as 850g but not stated with or without the BB.
i would presume without the BB.
https://www.rosebikes.co.uk/shimano-105 ... set-443978

Another site listed as 907g but again no statement as too with or without.

Thanks for that and Rose Bikes price is pretty good at the moment too - I'd missed their quoted weight. Trouble is that Bike24 quote 845 gm and then say that's for the double so I don't know what to believe. Then there's the doubt about the bearings being included or not, which seems to always to be around 90 gm by the way.

keyboardmonkey
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Re: Weight of Shimano FC-5703 triple with bearings

Postby keyboardmonkey » 27 Aug 2019, 11:16am

First of all I’m fairly certain that bearings are not included when buying FC-5703.

FC-5703 = 849g without the BB
6700 BB = 90g
6800 BB = 75g

The 6800 BB is readily available. Mine came with an adaptor to fit in to old BB tools made for, eg, the 5700 and 6700 BB.

Hope this helps.

NetworkMan
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Re: Weight of Shimano FC-5703 triple with bearings

Postby NetworkMan » 27 Aug 2019, 12:08pm

keyboardmonkey wrote:First of all I’m fairly certain that bearings are not included when buying FC-5703.

FC-5703 = 849g without the BB
6700 BB = 90g
6800 BB = 75g

The 6800 BB is readily available. Mine came with an adaptor to fit in to old BB tools made for, eg, the 5700 and 6700 BB.

Hope this helps.

Certainly does help and many thanks for weighing. My estimate of 25 gm for crank bolts was a touch too low so the TD2 kit now looks like 1025 gm. vs 924 gm. best for the FC-5703. I'm not quite being fair because I have 48-38-28 not 50-39-30 but even allowing for that I'm surprised the difference isn't more. The 5703 axle is hollow but perhaps the chunky-looking hollow cranks increase stiffness rather than save weight. Almost certainly not worth changing for me - I'd rather put £100+ into better, lighter wheels!