Thorn Cycles Forum
Technical => Wheels, Tyres and Brakes => Topic started by: njb on May 18, 2014, 12:05:41 AM
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Hi all,
My first post so I'll make a bit of an introduction.
I returned to cycling two years ago, started commuting to work and managed to do the biggest charity sportive here in Ireland last summer, 176KM.
I plan to do it again this July, a little faster than last year I hope.
So, I'm piecing together an order for a 550 frame, in grey.
Which of the many SKS chromoplastics do I order? there are 35, 45 and 50 mm variants?
I'm going to order marathon racers 700 by 30 on a Mavic A319 rim.
sound ok ?
Niall
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Hi Niall, and welcome to the Thorn Cycling Forums. Best of luck on your next sportive. What a cracking nice bike you'll have to ride. Someone will be along shortly to answer your question about mudguard width.
Best,
Dan.
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I ride with 50mm wide tires and P55 fenders - clearance is fine. So I bet you'd be fine with the 35 mm wide fenders. But I can't say for sure!
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i have 35 on my thorn audax widest tyres i'l use will be 28mm.
btw what part or ireland are you in,
im drogheda..
jags.
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Thanks for the replies, I'll get the 35s.
Thorn don't seem to put that sort of detail in their otherwise good brochures.
@Jags.
I'm in Naas, my commute in is 15K , and I stretch the return out to 65 K by coming home via the other side of the Blessington lakes.
I bring a pannier to work, hence the need for a rack.
I'ld like to venture a little further into the Wicklow hills, cardio vascular system allowing.
I have an old dawes sterling here, which I bought in 1990s, trying to get the road feel that it had. So I started looking at frames that might fit the bill.
Other audax owners have high praise for them hopefully I'll be agreeing with them in few weeks.
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30mm tyre? I would strongly recommend you get the 45mm SKS mudguards.
With a 35mm guard on a 30mm tyre that really only gives you about 3mm clearance all around your tyre - remember that it is (35-30)/2 on each side and the same all around. If you are likely to ride on any gravel roads, or even on tarmac, you only have to pick up a moderate sized stone or stick and you'll trash your mudguards. 45 was the size we always used with the old 1 1/8" tyres - about the same as 30mm. I use 35mm with my road bike but that runs tiny 19mm tyres. 35 is OK up to about 25mm or maybe 28mm.
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Thanks for the replies, I'll get the 35s 45s.
Thorn don't seem to put that sort of detail in their otherwise good brochures.
.....
Cheers il padrone, I think I understand.
Should I get the full mudguard kit to get the rear stays for the mudgaurds ?
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il padrone is much wiser than me he gives great advice so maybe the his advice is much better ;)
those wicklow hills are to much for this kid great part of the country though.
cheers
jags.
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I'd suggest the full length guards with all stays. There are the road racer (?) guards by SKS that are designed for bikes without stay-mounts, but you won't have that issue and their coverage is poor. The other thing you could go for with narrow tyres/tight clearance is the Crud Roadracers that fit much tighter frame clearances. They are not as durable nor rigid as SKS, I believe.
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Which of the many SKS chromoplastics do I order? there are 35, 45 and 50 mm variants?
I'm going to order marathon racers 700 by 30 on a Mavic A319 rim.
sound ok ?
Niall
Hi Niall, welcome to the forum, but I'm afraid I have to put a spanner in the works on the direction this thread is going.
Most audax bike frames designed for 47/57mm brakes are also designed for a maximum 28mm tyre. The Thron Audax is no exception, although it is accepted that many tyres labelled up to 32mm can be, in reality, only 28mm.
I have two audax type bikes (not Thorn) and the 35mm SKS Chromoplastic mudguards are a neat fit. There is no way 45mm mudguards would fit in between the chainstays or between the forks without some carving with a Stanley knife or some such implement.
Is there a specific reason you want 30mm tyres? I think 30mm tyres and A319 rims are more 'Club Tour' country.
I would recommend a 28mm tyre (Durano, Ultremo, or Conti Gatorskin) on Mavic Open Pro, or Open Sport rims - with 35mm SKS Chromoplastics, perfect fit for an audax bike, comfortable and fast enough for sportives, and strong enough for commuting or even light touring.
I would also suggest phoning SJSC, they would surely give you sound advice on this.
Jim
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Hi Niall
I run mine with 30mm marathon racers and they actually measure 28 and a sniff mm on my Ambrosio Evolution rims. Nice tyres,and I'd go bigger if 'twere possible.
As has been said above 45mm guards would need hacking to fit between the chainstays.
I use 35mm SKS longboards now and these a have a curved profile without corners like the old sks guards. Because of this they can sit just a smidge closer to the caliper and don't move when you operate the brake.
Splay the brackets on the guards before cutting the stays to length and you will get a workable but not generous clearance.
It's worth it because you'll get justa bout the plushest ride possible on a mark3 short of fitting Grand Bois tyres.
PS 32 Marathon Supremes also fit under these and I'd wager a lot of the 28mm tyres listed above measure smaller.
Happy fitting
Ian
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Welcome, Niall. Wet feet are a horror that interfere with proper rides. I don't know what will fit on your bike, but I agree with the tenor of Il Padrone's remarks, that you should fit the widest mudguards, and the longest, that you can, and if the spray catchers (short, stiff little guides, not great big dragging mud flaps) are extra, as they are on some SKS mudguards, get those too. I'd suggest the form of your question to SJS could be, "What are the widest and longest SKS mudguards I can fit, and what fitting kit and optional extras should I order?"
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theres a photo of my audax somewhere on the forum and john has a whole collection of photos of his audax bikes.
jags.
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http://www.thorncycles.co.uk/forums/index.php?topic=8613.75
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mmh.
The thing is I have the wheels already, my LBS built them to suit my Trek 7.5FX hybrid and I assumed they'ld be fine on the Thorn.
I've done 7000 KM on the the hybrid and the only mechanicals I've had are spokes snapping, I'm 95KG, I usually have 4 or 5Kgs of stuff with me. I haven't had a puncture either, that bike came with Bontrager all weather race 32 which I changed to Schwalble Marathon Original 35.
I read the spec on Mavic Askiums wheels and saw that the maximum specified weight for those is 100Kg, figured a light touring type wheel would suit hence the A319s and Deore hub. At the same time I didn't want a full tourer as allegedly they don't ride so well unloaded (I did 13 years in a landrover defender, when loaded it road like an american car ).
I guess I'm married to the wheels, but could consider starting a brief affair with some 28 mm tyres.
Thanks again for taking the time to post replies.
I shall email SJSC in the morning.
Niall
BTW. This is what I hold to make up the bike with;
Second hand:
4603 Tiagra Triple chain Wheels (50-39-30) and 170 mm cranks
Tiagra Triple Front DR
Tiagra 9 speed triple STIs.
New:
Shimano 4600 BB Cups (34/35/4500 double/triple) Eng
Deda RHM 02 Bars Black
Shimano 9 Spd HG50 (Sora/Tiagra) Cassette 12-25
Shimano R451 57mm Brakes Silver
Shimano Brake Cableset Deore
Shimano 9 Spd HG53 Chain (Sora/Tiagra 9/Deore)
Shimano 105 Silver (5701) 10 Spd Rear Gear Medium (GS)
Handbuilt wheels, rear is 36 spoke, front 32, Deore hubs Mavic A319 rims.
Stuff I can strip from current bike
B17 saddle, stem (or two), single sided spd pedals, Dura Ace bar ends and Tektro RL520s.
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http://www.thorncycles.co.uk/forums/index.php?topic=8613.75
http://www.thorncycles.co.uk/forums/index.php?topic=6803.msg42175#msg42175
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amazing how things turn out.. ::)
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Hi,
I emailed and SJSC and was advised to call.
So I spoke to Steve in Thorn, he went and offered up an A319 rim to an audax frame.
The A319s will not fit, so I guess they will remain with the hybrid.
He too recommended a mavic open sport or open pro rim, 28 mm tyres and 35 mm SKS.
Niall
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i have 319 with ribmo 28 tyres on my audax :o
i use them when i use panniers. at the moment i 'm using mavic sups with vittoria open corse 700x23
the mudguards are sks 35mm work perfect with both sets of wheels thats a fact. ;)
jags.
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i have 319 with ribmo 28 tyres on my audax :o
i use them when i use panniers. at the moment i 'm using mavic sups with vittoria open corse 700x23
the mudguards are sks 35mm work perfect with both sets of wheels thats a fact. ;)
jags.
Cheers Jags, I looked at the images of your audax, its red and blue, is it one of the older 853 audax frames ?
Niall
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yip but can't imagine the spec is that much different.
john (LEFTPOOLE) will know for certain .
jags.
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yip but can't imagine the spec is that much different.
john (LEFTPOOLE) will know for certain .
jags.
We'll all I can say is that I've fitted the same too both the older 853 and the MK 3
John
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@jags & john , I will try and do the same, probably early next week by the time all the kit is in the one place.
Niall
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should be fine Niall ;)
jags.
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An update,
The Frame was ordered with panaracer rimbo 28s and the SKS 35 mm guards.
All parts are now together.
My LBS had the rear A319 wheel built but not the front, so I asked him to hold off building the front.
He will do the build during the week.
When I went in, there was the Thorn box on the shop floor, amongst all the Treks and Giants.
Methinks wintertime might have been a quieter time of year to build a bike.
Niall
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so did the rear wheel fit i'm dead curious ;)
good wheel the 319 i bought mine from wiggle there were on sale at £110 i think hand finished mind you there was and still is a funny kinda squeel coming from the rear wheel, but i must have a 1000 miles on them not a bother still going strong.
best of luck with the new baby keep her well fed oiled and watered and it will only be CLASS.
jags.
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LBS is busy with all that shiny 6061 Al that arrived yesterday. I take it those bikes are just flat-packed and the retailer has to do relatively little to them to get them ready for the customer?
We also had a big triathlon today in the south of the county. So there was no fitting or offering up of the A319s to thorns done, twas all about race tuning of stealth carbon yesterday.
However I did drop in today and speak with the guy who'll be assembling it. He's a downhill MTB'er, steel hardtails from the 90s are what ring his bell.
We kit fondled the frame for a while, that polyester gunmetal looks good, hope it wears well. Not sure what to do about the downtube bosses, the cable outer sleeves mount on those do they not ?
When I picked it up and felt the frame weight and the tube size, there was a little fretting on my behalf, I am 90Kgs these days.
I read somewhere on this forum an email from Thorn steering some hefty rider towards the club tour rather than the audax.
I rationalised the fear by reminding myself I'll only have 5Kgs at most on the panniers.
Re-assurance welcome feck it, it'll be grand.
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Re-assurance welcome feck it, it'll be grand.
It was an Irish actress who first whispered to me the secret of success, "It'll be all right on the night."
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Hi,
Quick update, went in to the LBS on Saturday.
The bike was up on the stand being assembled, looks good in the flesh perhaps the Irish actress was right.
The bike mechanic and LBS owner said it was going to be a nice bike and was impressed by the build quality.
They are not alone, there has interest amongst some other customers.
Apparently the steerer tube is the longest they've seen, so they'll cut it twice, I'm to tell them where to make the second cut after I've ridden it for a while or gone to the fitter.
There was some discussion on record delta brakes, the BR450s look good.
@jags, the rear A319 wheel, did indeed fit :), spun well, mudgard will clear with the panaracer 28s.
Collecting tomorrow, I hope, short test spin tomorrow night.
Niall
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there ya go those boys at sjs no sod all ;D ;D ;D
joking joking ::)
jags.
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It is eventually built and it feels really, really good to ride, it moves well, just splendid really.
Tried to figure out these STI do-hickeys on a 30K ride after I picked it up this evening.
I think I got the sizing right, will bring it to a framebuilder/bikefitter to have it dialed in.
The 180K ride is on July 5th.
Thanks for all the advice, elected not to fit mudguards just yet, weather is too glorious here, might jinx it.
Ended up with A319 rims on Deore M615 rear hub and a T610 front hub with Panaracer rimbo 28s, 36 spokes in the rear, 32 on front.
(http://www.boards.ie/vbulletin/attachment.php?attachmentid=311242&stc=1&d=1403042069)
(http://www.boards.ie/vbulletin/attachment.php?attachmentid=311243&stc=1&d=1403042069)
Niall